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

EL731

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)

Datasheet

SE-601

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.)

Datasheet

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).