Latching Technology Used to Isolate Power Faults

A robust latching solenoid was designed with a manual reset feature for a manufacturer of medium voltage power distribution equipment who needed a solution for actuating the fault interrupter in a padmount switchgear.

Customer Problem

A manufacturer of medium voltage power distribution equipment needed a solution that would actuate the fault interrupter when their system detected a safety concern. It needed to remain in position until their system hardware was manually reset. The solution also needed to be stable in a wide range of temperatures.

The TLX Solution

TLX Technologies designed and produced a latching solenoid with a manual reset feature that eliminates the durability failure modes of standard U-frame designs. A permanent magnet holds the solenoid in the latched position, and when the system detects a fault, a short pulse de-latches the solenoid to activate the system’s fault interrupter. When the technician manually resets the system’s hardware after the fault is cleared, the solenoid consequently resets too. This solenoid is temperature stable and can release at -40°C in less than 12 ms.

Manual Reset Latching Solenoid

Release voltage
3 to 30 Vdc
Minimum trip energy
.030 J
Coil resistance at 20°C
5.75 ± 0.5 Ω
22.3 ± .635 mm
Response time
12 ms max.
Latched spring load
59.16 ± 5.78 N (13.3 ± 1.3 lbs.)
Net holding force
12 lbs. min.
Operating temperature range
-40°C to 50°C
Electric strength
500 Vac for 1 second
>100K cycles

All TLX components are customized to fit system requirements, meaning technical specifications are unique to each customer and design. Examples given on our website are for illustration purposes only.

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