Thermal overload relays are electronic components, which are often used in overcurrent, phase failure protection and 3-phase power imbalance protection for AC motors or other electrical equipment, circuit. As a type of overload protection component, thermal relay has wide applications in production due to its small size, simple structure and low price.
Thermal overload relay is composed of heating element, bimetal, contact and a set of transmission and adjustment mechanism. Relay coil is represented by a long box symbol in circuit. When the motor is overloaded, the current passing through the heating element exceeds the setting current, and the bimetallic sheet is heated up and bends away from the gusset, causing the normally closed contact to break. This will de-energize the contactor coil connected to the normally closed contact. The main contact of contactor is disconnected, and then the main circuit of motor is cut off, thus realizing overload protection function.
Low price thermal overload relay for sale. 8 current setting ranges for selection, minimum 0.1A, maximum 6A, rated operational current 25A, rated working voltage 3-phase 220V~690V, insulation voltage 690V, phase failure protection function, matching 9A contactor and 2A gG fuse breaker.
Cheap thermal overload relay for sale. 4 ranges of current setting for selection, 10~18 Amp, current rating 25A, working voltage 3-phase 220V~690V, insulation voltage 690V, phase failure protection function, suits 9A contactor and 4~20A gG fuse breaker.
Affordable price thermal overload relay for sale. Current setting range 23~32 Amp or 28~35 Amp for selection, working current rating 36A, power supply 3-phase 220V~690V, insulation voltage 690V, matches 25A contactor, 63A gG fuse breaker, overcurrent and phase failure protection for AC motors.
Thermal overload relay provides overcurrent and phase failure protection for AC motors. Current setting range 30-40Amp or 37-50Amp for selection, current rating 93A, working voltage 3-phase 220V~690V, insulation voltage 690V, matching 40A contactor and 63A/100A gG fuse breaker.
Good price 3-phase thermal overload relay for sale, features overcurrent and phase failure protection functions. Current setting range 55-70 Amp/ 60-80 Amp for selection, current rating 93A, working voltage 220V~690V, insulation voltage 690V, matched with 40A contactor and 100/125A gG fuse breaker.