Modular contactor ST25-20-M

ST25-20-M – compact 25 A contactor with manual control

The ST25-20-M is fitted with a manual control handle that allows the position of the contacts to be controlled manually, regardless of the coil’s state. An automatic operating mode is also available.

The manual control function facilitates commissioning, testing, and installation and maintenance work.

Check the variant

ST25-20 – 25 A, 2×NO without manual control. 

ST25-40-M – 25 A, 4×NO and manual control. 

ST40-40-M – 40 A, 4×NO and manual control.

The operation of the ST25-20-M contactor depends on the setting of the operating mode switch:

Position ‘I’ (top position)
If the contactor coil is not energised, the contactor contacts are closed. When the contactor is energised, the switch automatically moves to the ‘Auto’ position and from that moment on
it operates in automatic mode. To lock the contacts in the closed position, regardless of the contactor’s power supply, move the yellow locking lever to the left whilst in the ‘I’ position.



‘Auto’ position (centre position)
Applying power energises the contactor and closes the contacts. When the power is disconnected, the contactor de-energises and the contacts open.



‘O’ position (lower position)
The contactor’s contacts remain open regardless of whether the supply voltage is present.