ABB thermal overload relay

ABB Stotz S&J Thermal Overload Relay TF42-20

Manufacturer: ABB Stotz S&J
Designation: Thermal Overload Relay
Tripping Class: 10
Type: TF42-20
Adjustable Current Range: 16..20 A
Max. Rated Operating Voltage Ue: 690 V
Mounting Type: Direct Mounting
Connection Type Main Circuit: Screw Connection
Number of Auxiliary Contacts as Normally Open: 1
Number of Auxiliary Contacts as Normally Closed: 1
Number of Auxiliary Contacts as Changeover: 1
Tripping Class: CLASS 10
Reset Function Input: No
Automatic Reset Function: Yes
Push Button Reset Function: Yes

The ABB Stotz S&J Thermal Overload Relay TF42-20 is a cost-effective electromechanical motor protection device for currents up to 38 A. In the event of an overload, it provides reliable thermal protection for the connected motors. TF42 relays are typically mounted on contactors AF09 to AF38 but can also be mounted separately on a DIN rail. When the motor current exceeds the set value on the current scale, the relays trip via bimetallic elements, thereby changing the switching position of the two auxiliary contacts 1S/1Ö. A pre-connected contactor is then switched off. The relays allow for manual or automatic reset, feature a test and stop function, and have a tripped indicator. The current scale of the devices is sealable. Accessories such as reset buttons and remote reset devices complement the range. TF42 relays have a tripping class of 10, are temperature compensated, sensitive to phase failure, and have ATEX certification.