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.
Thermal Unit, Type S, Type A, melting alloy, Class 20
Thermal Unit, Type S, Type A, melting alloy, Class 20
SKU: 1277432
Category: Automation & Control
Reviews (0)
Be the first to review “Thermal Unit, Type S, Type A, melting alloy, Class 20” Cancel reply
Related products
Wall mounted steel enclosure, Spacial S3D, plain door, without mounting plate, 600x600x300mm, IP66, IK10
Wall mounted steel enclosure, Spacial S3D, plain door, without mounting plate, 600x600x300mm, IP66, IK10
servo motor BSH, Lexium 05, 7.8N.m, 2500rpm, 100mm, keyed shaft, Sincos multi turn, without brake, IP50
servo motor BSH, Lexium 05, 7.8N.m, 2500rpm, 100mm, keyed shaft, Sincos multi turn, without brake, IP50
discrete output module Modicon Quantum – 32 O – positive logic (source)
discrete output module Modicon Quantum - 32 O - positive logic (source)
Inductive proximity sensors XS, inductive sensor XS6 M30, L74mm, brass, Sn22mm, 24…240VAC/DC, 1/2″
Inductive proximity sensors XS, inductive sensor XS6 M30, L74mm, brass, Sn22mm, 24...240VAC/DC, 1/2"
Harmony XB5, Light block with body/fixing collar, plastic, blue, integral LED, 24 V AC/DC, 1 NO + 1 NC
Harmony XB5, Light block with body/fixing collar, plastic, blue, integral LED, 24 V AC/DC, 1 NO + 1 NC
Safety light curtain type 4, Telemecanique Safety light curtains XUSL, XUSL Body protection, Std sensing range, 3 Beams, Hp = 810 mm
Safety light curtain type 4, Telemecanique Safety light curtains XUSL, XUSL Body protection, Std sensing range, 3 Beams, Hp = 810 mm
Mechanical alternator, Square D Pumptrol, closed tank, NEMA 1, screw in bushing, 4NC DPST DB contacts
Mechanical alternator, Square D Pumptrol, closed tank, NEMA 1, screw in bushing, 4NC DPST DB contacts
Reviews
There are no reviews yet.