Archive for the ‘UPS’ Category

Castell key application – Power Supply Isolation – UPS Switching

Monday, April 5th, 2010

 Assuming the following conditions:

Single Point of Access (Part Body)
Power Supply Isolation – UPS Switching

The Castell KSUPS-20 is a heavy-duty solenoid controlled trapped key interlock switch designed to control access to hazardous machines with rundown times or for use where machinery must complete an operating cycle before the power supply is disconnected. The unit is also suitable for use with uninterrupted power supplies (UPS) to control the changeover of two or more power sources.


In normal operating condition, the switch contacts are closed, the key is trapped and the solenoid de-energised. The key can only be turned and released after the solenoid has been energised via remote electrical signal. Turning the key changes the condition of the switch and releases the key, which can then be transferred to an access interlock. This allows access or entry into the hazardous area.