Motor Protection Circuit Breakers

Motor protection circuit breakers act as protection devices for electric motors, monitoring the electrical supply in motor circuits of 50-60Hz. They protect against phase unbalances and losses, which are detrimental to motors, offer protection against current overload, and prevent short circuits.


What are motor protection circuit breakers used for?

Motor protection circuit breakers are useful in industrial and building applications such as chillers, compressors, heat pumps and cooling towers, to prevent damages from short circuits or power surges. In the manufacturing industry, circuit breakers interrupt electrical faults below the breaking capacity, which protects machinery and equipment from blowouts.


Types of motor protection circuit breakers

Motor protection circuit breakers come in A type or B type classifications, dependent on utilisation and function.


The A type breaker is not explicitly intended for selectivity and does not allow intentional short time delay under short circuit conditions.This means that the system interrupts immediately when current or voltage levels match the breaking capacity.


Type B breakers allow for an intentional and adjustable short time delay under short circuit conditions, which enables the system to continue for a short while with currents exceeding breaking capacity levels.


...
Read more Read less

Filters

Viewing 81 - 100 of 471 products
Results per page
Description Price Current Range Number of Poles Range Breaking Capacity Terminal Type Voltage Rating Reset Method Length Width Depth Dimensions For Use With Series
RS Stock No. 711-6442
Mfr. Part No.MS132-0.16
BrandABB
TWD2,530.00
Each
units
- 3P - - - 690 V ac - - - - - - MS132
RS Stock No. 136-7845
Mfr. Part No.SM1R3200
BrandLovato
TWD3,342.00
Each
units
24 → 32 A 3 - 25 (Ics) kA, 50 (Icu) kA Screw 690 V Rotary Knob 44.8mm 91.1mm 96.6mm 44.8 x 91.1 x 96.6 mm High IE3 Efficiency Value Motors SM1R
RS Stock No. 900-2103
Mfr. Part No.MA2.5UM
BrandAltech
TWD3,179.00
Each
units
- 3P - 42 kA - - - - - - - - MA
RS Stock No. 755-2741
Mfr. Part No.3RV1321-1BC10
BrandSiemens
TWD2,502.00
Each
units
2 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 97mm 45mm 96mm 97 x 45 x 96 mm - -
RS Stock No. 755-2909
Mfr. Part No.3RV2311-1AC10
BrandSiemens
TWD2,188.00
Each
units
1.6 A 3P Sirius Innovation 100 kA Screw 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - -
RS Stock No. 755-2832
Mfr. Part No.3RV1342-4LC10
BrandSiemens
TWD16,661.00
Each
units
90 A 3P Sirius Innovation 100 kA Screw 690 V ac/dc - 165mm 70mm 174mm 165 x 70 x 174 mm - -
RS Stock No. 124-3097
Mfr. Part No.3RV2011-1BA15
BrandSiemens
TWD2,706.00
Each
units
1.4 → 2 A 3 Sirius Innovation 100 kA @ 400 V ac Screw 690 V ac Manual 45mm 96.9mm 97mm 45 x 97 x 96.9 mm Three Phase Motors SRV2
RS Stock No. 706-1746
Mfr. Part No.3RV2011-0FA20
BrandSiemens
TWD1,848.00
Each
units
0.35 → 0.5 A 3P Sirius Innovation 100 kA Cage Clamp 690 V - 97mm 45mm 91mm 97 x 45 x 91 mm - 3RV2
RS Stock No. 136-7834
Mfr. Part No.SM1R0063
BrandLovato
TWD1,518.00
Each
units
0.4 → 0.63 A 3 - 100 (Ics) kA, 100 (Icu) kA Screw 690 V Rotary Knob 44.8mm 91.1mm 96.6mm 44.8 x 91.1 x 96.6 mm High IE3 Efficiency Value Motors SM1R
RS Stock No. 866-1313
Mfr. Part No.PKZM0-16/AK
BrandEaton
TWD2,984.00
Each
units
10 → 16 A 3P - 60 kA Screw 690 V ac Manual 45mm 93mm 94mm 45 x 93 x 94 mm - PKZM 0
RS Stock No. 136-7854
Mfr. Part No.SM1X14230
BrandLovato
TWD895.00
Each
units
- - - - Screw 230 V ac - 18mm 80mm 90mm 18 x 80 x 90 mm SM1 Motor Protection Circuit Breakers SM1X
RS Stock No. 187-712
Mfr. Part No.GV2RT03
TWD3,148.00
Each
units
0.25 → 0.4 A 3P TeSys - - 690 V - 89mm 44.5mm 78.5mm 89 x 44.5 x 78.5 mm - GV2R
RS Stock No. 445-0358
Mfr. Part No.MS116-2.5
BrandABB
TWD2,543.00
Each
units
1.6 2.5 A 3P - 50 kA Screw 690 V ac - - - - 45 x 90 x 85.6 mm - MS116
RS Stock No. 619-4684
Mfr. Part No.PKZM4-16
BrandEaton
TWD5,243.00
Each
units
10 → 16 A 3P - 60 kA Screw 690 V ac - 140mm 55mm 160mm 140 x 55 x 160 mm - PKZM 4
RS Stock No. 400-1439
Mfr. Part No.GV2ME21
TWD2,291.00
Each
units
17 → 23 A 3P TeSys 3 kA Screw 690 V - 89mm 44.5mm 78.2mm 89 x 44.5 x 78.2 mm - GV2M
RS Stock No. 136-7869
Mfr. Part No.SM1X3241R
BrandLovato
TWD615.00
Each
units
26 38 A - - - - - - - - - - SM1R Motor Protection Circuit Breakers SM1X
RS Stock No. 900-2112
Mfr. Part No.MA20UM
BrandAltech
TWD3,597.00
Each
units
- 3P - 20 kA - - - - - - - - MA
RS Stock No. 899-5183
Mfr. Part No.DC1CU2L
BrandAltech
TWD817.00
Each
units
- 1 - 10 kA - - - - - - - - L
RS Stock No. 445-0386
Mfr. Part No.MS116-6.3
BrandABB
TWD2,543.00
Each
units
4 6.30 A 3P - 50 kA Screw 690 V ac - - - - 45 x 90 x 85.6 mm - MS116
RS Stock No. 492-1579
Mfr. Part No.PKZM01-12
BrandEaton
TWD2,783.00
Each
units
10 → 12 A 3P - 60 kA Screw 690 V ac - 93mm 45mm 90.5mm 93 x 45 x 90.5 mm - PKZM 01