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.
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.)
Littelfuse is a global leader in circuit protection, power semiconductors and power control and sensing platforms. The company was founded in 1927 and acquired IXYS Corporation in 2018.
You can find further information on Littelfuse using the following links:
Tel: 01444 243 452
Fax: 01444 870 722