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Showing Results For: Motor Protection Circuit Breakers

Motor Protection Circuit Breakers

Motor Protection Circuit Breakers (MPCBs), also called motor circuit protectors, are specialised electromechanical devices engineered to safeguard electric motors from various electrical faults and overloads. They detect electrical anomalies such as overcurrent, short circuits, phase imbalance, and thermal overload and interrupt the circuit to prevent damage to the motors and associated equipment. A motor protection circuit breaker is indispensable in environments where motor-driven machinery is prevalent, ensuring comprehensive safety and operational efficiency. MPCBs integrate a thermal device (thermal overload relay) and magnetic device, thus serving as dual-function circuit breakers, protecting against short circuits, overloads, and other electrical failures.

Why Buy a Motor Protection Circuit Breaker?

MPCBs are significant in interrupting excessive current flow, which can cause motor damage or fire hazards. They are compact, cost-effective, and adjustable, allowing precise settings aligned with the specific needs of the motor to be protected. Motor protection circuit breakers benefit users by efficiently detecting various faults, thus enhancing the lifespan of machinery and maintaining optimal performance. Additionally, MPCBs often boast advanced features like manual control for switching the motor on or off, providing a convenient method for maintenance and emergency handling.

Popular Types of Motor Protection Circuit Breakers

MPCBs come in various types based on their operational mechanisms, integrated elements, and type of protection, such as:

  • Thermal Magnetic MPCBs – These circuit breakers protect against long-term overload conditions. A thermal magnetic MPCB provides quick action during short circuits through an electromagnetic mechanism that trips the breaker instantly when a high current is detected.
  • Magnetic-Only MPCBs – These devices come only with magnetic elements, protecting against short circuits. These breakers are suitable where precise overload protection is handled by other means.
  • Electronic MPCBs – These circuit breakers are the more precise devices that provide adjustable trip settings. They utilise electronic sensing and relay logic to provide both overload and short-circuit protection. 
  • Manual MPCBs – These are manual switches designed to protect a motor by allowing operators to control it manually. They do not use bimetallic strips or magnetic coils.
  • Combination Starters – These devices combine an MPCB with a contactor for both protection and control of the motor. They provide a comprehensive solution that can include overload, short-circuit, and under-voltage protection.

Typical Applications of Motor Protection Circuit Breakers

MPCBs find versatile applications across residential, commercial, and industrial motor-driven systems where electric motors are used and require electrical protection. Some typical applications of MPCBs include:

  • Manufacturing
  • HVAC Systems
  • Pumps
  • Compressors
  • Refrigerators
  • Elevators & Escalators
  • Washing Machines.

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3RV10110HA10, Siemens
11 In Stock
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£ 42.56
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£ 40.01
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£ 38.31
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3RV10111FA10, Siemens
11 In Stock
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£ 65.92
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3RV10111CA10, Siemens
1 In Stock
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£ 57.60
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3RV10111HA10, Siemens
7 In Stock
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£ 57.60
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3RV10111GA10, Siemens
Pre Order
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£ 57.60
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3RV10110AA10, Siemens
3 In Stock
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£ 39.33
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£ 36.98
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£ 35.39
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3RV10111EA10, Siemens
25 In Stock
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£ 65.92
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3RV10110JA10, Siemens
11 In Stock
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£ 42.56
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£ 40.01
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£ 38.31
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3RV10111AA10, Siemens
32 In Stock
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£ 45.14
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£ 42.44
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£ 40.64
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3RV10110EA10, Siemens
13 In Stock
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£ 41.04
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£ 38.58
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£ 36.94
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3RV10110KA10, Siemens
12 In Stock
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£ 45.14
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£ 42.44
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£ 40.64
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3RV10110BA10, Siemens
9 In Stock
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£ 39.33
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£ 36.98
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£ 35.39
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3RV10111DA10, Siemens
8 In Stock
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£ 47.44
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£ 44.59
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£ 42.70
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3RV10110CA10, Siemens
3 In Stock
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£ 39.33
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£ 36.98
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£ 35.39
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3RV10111KA10, Siemens
12 In Stock
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£ 52.99
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£ 49.81
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£ 47.69
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3RV10110FA10, Siemens
13 In Stock
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£ 39.66
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£ 37.28
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£ 35.70
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3RV10111BA10, Siemens
25 In Stock
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£ 47.44
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£ 44.59
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£ 42.70
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3RV10110DA10, Siemens
20 In Stock
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£ 41.04
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£ 38.58
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£ 36.94
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3RV10111JA10, Siemens
6 In Stock
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£ 73.24
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3RV10110GA10, Siemens
11 In Stock
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£ 39.99
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£ 37.59
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£ 35.98
072734 | PKZM0-1, Eaton
52 In Stock
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£ 63.11
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£ 59.32
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£ 56.81
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072738 | PKZM0-6,3, Eaton
2 In Stock
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£ 88.36
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£ 83.07
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£ 79.54
072737 | PKZM0-4, Eaton
13 In Stock
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£ 88.36
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£ 83.07
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£ 79.54
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072732 | PKZM0-0,4, Eaton
17 In Stock
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£ 73.61
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£ 69.17
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£ 66.26
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072730 | PKZM0-0,16, Eaton
23 In Stock
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£ 52.57
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£ 49.41
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£ 47.33
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New Items
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3RV10110DA20, Siemens

3RV10110DA20, Siemens

Circuit Breakers 3 Pole - 3RV10 & 3RV13 Range Siemens 3RV10 and 3RV13 moulded case circuit breakers are compact, current limiting motor starter protectors which can be used in motor feeders for special voltages of 440V, 480V, 550V and 690V. They are used for switching and protecting induction motors and other loads with rated currents up to 800A. For motor protection the overload and short-circuit releases are designed for optimized protection and direct starting of induction squirrel cage motors. The motor starter protectors have an electronic release which not only provides short circuit and overload protection but is also sensitive to phase failure and phase unbalance and offers protection in the event of rotor blockage. For starter combinations these moulded case motor starter protectors are used for short circuit protection in combinations of circuit breaker, motor contactor and overload relay. They are equipped with a purely magnetic release (up to 32A) or a electronic release (100A to 800A). High short circuit breaking capacity in the feeder Optimum usability in load feeders for the special voltages 440V, 480V, 550V and 690V Compact design The releases are available both in purely magnetic (up to 32 A) and in solid-state versions (100A to 800A) Note Most of the Sirius 3R components are available with cage clamp connections. For the size S00 products, with rating up to 5.5kW, this includes both power and control circuit connections. For higher rated products cage clamp is available for the control wiring connections such as operating coils and auxiliary contacts. Siemens SIRIUS Cage Clamp Technology As an alternative to screw connections a large number of Siemens low voltage components are also available with cage clamp connections.,Solid, stranded and finely stranded conductors, with or without end sleeve...
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11 SM1B 04, Lovato

11 SM1B 04, Lovato

SM1 Motor Protection Circuit Breakers SM1 is a series of motor protection circuit breakers with an integrated magnetic trip indicator which avoid closing operations during short-circuit conditions. This range of circuit breakers features thermal and magnetic releases and high breaking capacity. Lovato Motor Protection Circuit Breakers
New items
DC2DU20L, Altech

DC2DU20L, Altech

Altech L Series DC MCBs Altech L series DC MCBs suitable for motor disconnect, overload protection, general purpose DC use, DC discharge and uninterruptable power supplies. DIN Rail Mounted 17.5mm width Thermal Magnetic 240 V, 480Y / 277 V AC 50/60Hz 125 V dc (1 pole); 250 V dc (2pole) 10kA Short Circuit Interrupting Capacity Positive Trip indicator (Green - off/tripped, Red - on) Line/Load reversible Altech MCBs
New items
RP2101, Altech

RP2101, Altech

Altech RP Series Altech RP series RCCB compact earth leakage circuit breakers detect and interrupt earth faults. They are VDE approved for European systems of protecting people, animals, equipment and property from dangerous line-to-ground and shock hazard cur rents. Applications for the 300 mA and 500 mA ratings are equipment protection and fire prevention, limiting the energy of a fault to less than the minimum ignition energy for many materials. Altech MCBs
New items
072734 | PKZM0-1, Eaton

072734 | PKZM0-1, Eaton

Eaton Motor Protective Circuit Breaker - PKZM0 Eaton's reliable and robust motor protection circuit breakers are the perfect solution for protecting your motors from faults such as an overload of high voltages, short circuits or relay shutdowns. Down-time of machinery can be detrimental to a business and its operations, Eaton's PKZM0 range of motor protection circuit breakers has been created and designed to act as an intermediary between your devices, protecting vital equipment in the event of unforeseen incidents. This reduces the amount of downtime of machinery to enable operations to continue running smoothly. Features & Benefits • DIN-rail mounting • Forms part of the xStart family of control gear products • Typical moto protection accessories – Shunt release 492-1709 & 492-1715 , lockable rotary handle 244-0113 • Rated operating voltage 690Vac How do I select the right Motor Protection Circuit Breaker? MPCBs are more critical now than ever. Most infrastructures now rely on a motor behind the scenes to power critical uninterruptible systems such as heating, ventilation and cooling. These systems are vital in ensuring business continues as usual, therefore must be protected against overcurrent's, thermal overloads and similar problems. To select the right MPCB, consider the systems you and your business rely upon. Checking the features and benefits of each MPCB will prove invaluable when deciding what critical infrastructure you wish to protect.
New items
PKZM01-0.16, Eaton

PKZM01-0.16, Eaton

PKZM01 Pushbutton Operated MPCB Modular Motor Protective Circuit Breakers designed for use with add-on contactor modules and accessories (see below) which provide isolation, short circuit and thermal protection. The units are DIN-rail mounting and part of the xStart family of control gear products, and a range of connection and wiring accessories are available to speed up assembly work and minimise wiring errors.,Various enclosure options are available, see PKZM Enclosures range. Rated operating voltage 690Vac Operating temperature range -25°C to +55°C Temperature compensated range -5°C to +40°C Adjustable current trip level, 0.6 – 1.0 x nominal rating Short-circuit trip level (fixed) 14x nominal rating Single-phase-failure sensitivity to IEC60947-4-1 Simple two-button operation for starting and stopping motors May be locked in the "off" position Approvals UL, CSA, LROS, GL Standards IEC (EN60) 947-1 general, 947-2 Circuit breakers, 1-4 switch disconnectors, 1-5 Motor starters, 1-6 Electrical equipment of machines
New items
3RV10111CA20, Siemens

3RV10111CA20, Siemens

Circuit Breakers 3 Pole - 3RV10 & 3RV13 Range Siemens 3RV10 and 3RV13 moulded case circuit breakers are compact, current limiting motor starter protectors which can be used in motor feeders for special voltages of 440V, 480V, 550V and 690V. They are used for switching and protecting induction motors and other loads with rated currents up to 800A. For motor protection the overload and short-circuit releases are designed for optimized protection and direct starting of induction squirrel cage motors. The motor starter protectors have an electronic release which not only provides short circuit and overload protection but is also sensitive to phase failure and phase unbalance and offers protection in the event of rotor blockage. For starter combinations these moulded case motor starter protectors are used for short circuit protection in combinations of circuit breaker, motor contactor and overload relay. They are equipped with a purely magnetic release (up to 32A) or a electronic release (100A to 800A). High short circuit breaking capacity in the feeder Optimum usability in load feeders for the special voltages 440V, 480V, 550V and 690V Compact design The releases are available both in purely magnetic (up to 32 A) and in solid-state versions (100A to 800A) Note Most of the Sirius 3R components are available with cage clamp connections. For the size S00 products, with rating up to 5.5kW, this includes both power and control circuit connections. For higher rated products cage clamp is available for the control wiring connections such as operating coils and auxiliary contacts. Siemens SIRIUS Cage Clamp Technology As an alternative to screw connections a large number of Siemens low voltage components are also available with cage clamp connections.,Solid, stranded and finely stranded conductors, with or without end sleeves, can be connected, where two conductors can be clamped independent of one another at each terminal.,Inserting a flat bladed screwdriver opens t...
New items
PKZM0-0,25, Eaton

PKZM0-0,25, Eaton

PKZM0 Rotary Switch Operated MPCB Modular Motor Protective Circuit Breakers designed for use with add-on contactor modules and accessories which provide isolation, short circuit and thermal protection. The units are DIN-rail mounting and part of the xStart family of control gear products, and a range of connection and wiring accessories are available to speed up assembly work and minimise wiring errors.,Various enclosure options are available, see PKZM Enclosures range. Rated operating voltage 690Vac Operating temperature range -25°C to +55°C Temperature compensated range -5°C to +40°C Adjustable current trip level, 0.6 – 1.0 x nominal rating Short-circuit trip level (fixed) 14x nominal rating Single-phase-failure sensitivity to IEC60947-4-1 Dimensions 195 x 45 x 77 (HxWxD) mm Rotary switch operation with padlockable handle option, see accessories On/Off/Tripped indication may be locked in the "off" position with handle Approvals UL, CSA, LROS, GL Standards IEC (EN60) 947-1 general, 947-2 Circuit breakers, 1-4 switch disconnectors, 1-5 Motor starters, 1-6 Electrical equipment of machines
New items
DC1CU20L, Altech

DC1CU20L, Altech

Altech L Series DC MCBs Altech L series DC MCBs suitable for motor disconnect, overload protection, general purpose DC use, DC discharge and uninterruptable power supplies. DIN Rail Mounted 17.5mm width Thermal Magnetic 240 V, 480Y / 277 V AC 50/60Hz 125 V dc (1 pole); 250 V dc (2pole) 10kA Short Circuit Interrupting Capacity Positive Trip indicator (Green - off/tripped, Red - on) Line/Load reversible Altech MCBs
New items
3RV10110AA10, Siemens

3RV10110AA10, Siemens

Three-pole Circuit Breakers – 3RV10 Range Maximum rated current 100A (45kW @ 400V a.c.) Rated operational voltage: 690V Short-circuit proof to 50kA @ 400V a.c. Maximum switching frequency; 15 operations/hour Mechanical life; 10 5 operations Ambient temperature range; –20 to +60 ° C Long term stability Manual reset Lockable in off position Approvals UL, CSA Standards IEC947, VDE0990, EN60947 Warning This product is in obsolescence mode and is due for discontinuation by the manufacturer. We recommend that you review the alternative highlighted by the manufacturer. Alternatively, refer to the cross reference list in the Technical Reference section which highlights the upgrade path for your current generation of products.
New items
3RV10110HA10, Siemens

3RV10110HA10, Siemens

Three-pole Circuit Breakers – 3RV10 Range Maximum rated current 100A (45kW @ 400V a.c.) Rated operational voltage: 690V Short-circuit proof to 50kA @ 400V a.c. Maximum switching frequency; 15 operations/hour Mechanical life; 10 5 operations Ambient temperature range; –20 to +60 ° C Long term stability Manual reset Lockable in off position Approvals UL, CSA Standards IEC947, VDE0990, EN60947 Warning This product is in obsolescence mode and is due for discontinuation by the manufacturer. We recommend that you review the alternative highlighted by the manufacturer. Alternatively, refer to the cross reference list in the Technical Reference section which highlights the upgrade path for your current generation of products.
New items
3RV10111EA10, Siemens

3RV10111EA10, Siemens

Three-pole Circuit Breakers – 3RV10 Range Maximum rated current 100A (45kW @ 400V a.c.) Rated operational voltage: 690V Short-circuit proof to 50kA @ 400V a.c. Maximum switching frequency; 15 operations/hour Mechanical life; 10 5 operations Ambient temperature range; –20 to +60 ° C Long term stability Manual reset Lockable in off position Approvals UL, CSA Standards IEC947, VDE0990, EN60947 Warning This product is in obsolescence mode and is due for discontinuation by the manufacturer. We recommend that you review the alternative highlighted by the manufacturer. Alternatively, refer to the cross reference list in the Technical Reference section which highlights the upgrade path for your current generation of products.
FAQs
We offer free shipping for orders over £200 if delivery is in the UK. All other orders in the UK, shipping from £7.99 depending on the weight and measurement. Mainland Europe shipping charges start from £25. For all other countries shipping charges start from £50 for products like Motor Protection Circuit Breakers and all others.
You can email us directly at sales@enrgtech.co.uk or via our website for any queries regarding Motor Protection Circuit Breakers or any other product.
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Yes, we offer special discounts on orders above £200 for Motor Protection Circuit Breakers and all other products.
UK orders normally take between 2/3 working days. International orders normally take between 3/5 working days for all products including Motor Protection Circuit Breakers.
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