Thermal units are intended to protect motors, controllers, and branch-circuit conductors against excessive heating due to prolonged motor over-currents up to and including locked rotor currents. Protection of the motor and the other branch circuit components from higher currents, due to short circuits or grounds, is a function of the branch circuit fuses or circuit breakers. Class 20 thermal units respond to overload current conditions according to trip curves. These thermal units will trip in 20 seconds or less on overload conditions. These thermal units have a one piece construction. The motor current passes through a small heater winding within these thermal units. Under overload conditions, the heat causes a special solder to melt allowing a ratchet wheel to spin free thus opening the control circuit contacts and opening the motor contacts. AIC Rating in accordance with UL512 is 20,000 Amp. This fuse holder is UL listed and CSA certified.
Thermal Unit, Type S, Type B, melting alloy, Class 20
Thermal Unit, Type S, Type B, melting alloy, Class 20
SKU: 894415
Category: NEMA Contactors & Starters
Reviews (0)
Be the first to review “Thermal Unit, Type S, Type B, melting alloy, Class 20” Cancel reply
Related products
NEMA Contactor, TeSys N, reversing, Size 2, 45A, 25HP at 460VAC, 3 pole, 3 phase, 120VAC 50/60Hz coil, open
NEMA Contactor, TeSys N, reversing, Size 2, 45A, 25HP at 460VAC, 3 pole, 3 phase, 120VAC 50/60Hz coil, open
IEC contactor, TeSys Deca, nonreversing, 80A resistive, 4 pole, 4 NO, 110VAC 50/60Hz coil, open style
IEC contactor, TeSys Deca, nonreversing, 80A resistive, 4 pole, 4 NO, 110VAC 50/60Hz coil, open style
IEC contactor, TeSys Deca, nonreversing, 20A resistive, 4 pole, 2 NO and 2 NC, 24VDC coil, open style
IEC contactor, TeSys Deca, nonreversing, 20A resistive, 4 pole, 2 NO and 2 NC, 24VDC coil, open style
TeSys F contactor – 3P (3 NO) – AC-3 – <= 440 V 225 A – coil 240 V AC
TeSys F contactor - 3P (3 NO) - AC-3 - <= 440 V 225 A - coil 240 V AC
IEC contactor, TeSys Deca, nonreversing, 20A resistive, 4 pole, 4 NO, 110VDC coil, open style
IEC contactor, TeSys Deca, nonreversing, 20A resistive, 4 pole, 4 NO, 110VDC coil, open style
IEC contactor, TeSys Deca, nonreversing, 32A, 20HP at 480VAC, up to 100kA SCCR, 3 phase, 3 NO, 380VAC 50/60Hz coil, open
IEC contactor, TeSys Deca, nonreversing, 32A, 20HP at 480VAC, up to 100kA SCCR, 3 phase, 3 NO, 380VAC 50/60Hz coil, open
NEMA Starter, Type S, reversing, vertical, Size 5, 270A, 200 HP at 575 VAC, 10 kA SCCR, 3 phase, 3 pole, melting alloy overload, 120 VAC coil, open
NEMA Starter, Type S, reversing, vertical, Size 5, 270A, 200 HP at 575 VAC, 10 kA SCCR, 3 phase, 3 pole, melting alloy overload, 120 VAC coil, open
TeSys F contactor – 3P (3 NO) – AC-3 – <= 440 V 115 A – coil 120 V AC
TeSys F contactor - 3P (3 NO) - AC-3 - <= 440 V 115 A - coil 120 V AC
Reviews
There are no reviews yet.