Switch Overload Relay

Our Switch Overload Relays remove energy from a switch-control relay when a switch machine motor is overloaded by an obstruction. This family of relays is designed to ensure the relay picks up when an overload current is detected and remains held until the switch request is removed – automatically resetting the relay.

Customer Benefits

• Heavy-duty contacts with magnetic blow-out
• Slow pickup
• Make-before-break relay contacts

Automatic Reset Relays for Switch Machine Safety

The Switch Overload Relays are used with switches operating at either 20 or 24 VDC (low) or 110 VDC (high) voltage levels, and work seamlessly with KB Signaling’s 5E, 5F, and 5R Switch Machines.

The Switch Overload Relay’s low-resistance coil picks up on motor overload current, while its high-resistance coil holds the relay in the picked position with the switch-control circuit energized. When the relay picks up, the Switch Control Relay releases to cut switch machine motor energy. Once the control circuit’s energy is removed, the Switch Overload Relay releases, permitting switch movement reversal.