Power Assemblies and Controllers

Circuit Protection

Solar Protection Relays

Littelfuse’s protection relays receives inputs such as current, voltage, resistance or temperature and compares them to set points and provides outputs such as visual feedback in the form of indicator lights, alphanumeric display, communications, control warnings, alarms and turning power off and on.

Littelfuse Solar Protection Relays by GD Rectifiers

Littelfuse offers two devices, EL731 – a microprocessor-based AC/DC relay or SE-601 - a DC device suited to solar and transportation systems.



Operates on AC resistance grounded systems and DC grounded systems. Littelfuse’s EL731 is a microprocessor-based AC/DC sensitive earth-leakage relay that offers complete coverage for all frequencies from 0-6,000Hz. One CT can be used for only low-or high-frequency detection or two CT’s are required for the entire frequency range. 

Supply Voltage (VAC): 24, 120/240

Supply Voltage (VDC): 24, 48, 120/240, 120/240

Relay Contacts: Three Form C (N.O./N.C)




This device operates on DC ungrounded systems ranging from industrial 24Vdc control circuits to 1000Vdc solar and transportation systems. It provides sensitive ground-fault protection without the problems associated with nuisance tripping. Ground-fault current is sensed using an SE-GRM Series Ground-Reference Module – a resistor network that limits ground-fault current to 25mA.

Supply Voltage (VAC): 120-240

Supply Voltage (VDC): 100-240, 40-55, 12-30

Relay Contacts: One Form A (N.O.); One Form B (N.C.)



For further information on Littelfuse’s Protection Relays, please call GD Rectifiers on: 01444 243 452 or email: .(JavaScript must be enabled to view this email address).


Littelfuse is a global manufacturer of leading technologies in circuit protection, power control, and sensing. Littelfuse products are found in automotive and commercial vehicles, industrial applications, data and telecommunications, medical devices, consumer electronics, and appliances. They partner with customers to design, manufacture, and deliver innovative, high-quality solutions, for a safer, greener, and increasingly connected world—everywhere, every day.

Further information:

You can find further information on Littelfuse using the following links:

Tel: 01444 243 452

Fax: 01444 870 722

Email: enquiries@gdrectifiers.co.uk