Protection Relays & Systems
Protection relays detect abnormal operating conditions in an industrial system and may trigger an alert or isolate the offending device from the system. Common detection functions include; Arc-flash, temperature monitoring, ground fault, over-current, over-voltage, reverse power flow, over-frequency, under-frequency and phase loss, sequence or imbalance.
Sourcing Hamlin / Littelfuse Protection Relays & Systems: in-stock lines for quick ship, BOM matching for multi-line builds, and original-channel screening — not keyword stuffing.
Product List
Total Components: 22
| Product | Pricing | Datasheet | Features | Mounting Type | Operating Temperature | Delay Time | Trip Range | Function | Termination Style | Voltage - Supply | Stock & Quantity |
|---|---|---|---|---|---|---|---|---|---|---|---|
 PGR-3100 Hamlin / Littelfuse | 1 $618.9600 | Test Button | Panel Mount | - | - | - | Ground Fault | Screw Terminal | 600VAC | 8,279 | |
 SE-105 Hamlin / Littelfuse | 1 $1.0000 | Automatic Reset, Manual Reset | Chassis Mount | - | 0.1 ~ 1s | 0.5 ~ 5A | Ground Fault | Screw Terminal | 120VAC | 5,294 | |
 777-P2 Hamlin / Littelfuse | 1 $590.7900 | - | Chassis Mount | -20°C ~ 70°C | - | 200 ~ 480V AC | Multiple | Screw Terminal | 200 ~ 480VAC | 2,199 | |
 EL3100-00 Hamlin / Littelfuse | 1 $767.7300 | - | Chassis Mount, DIN Rail | - | - | - | Ground Fault | Screw Terminal | 208 ~ 600VAC | 8,682 | |
 SE-701-0U Hamlin / Littelfuse | 1 $926.1000 | CT Loop Monitoring, Harmonic Filtering, Manual Reset, Test Button | Chassis Mount, DIN Rail | -40°C ~ 60°C | 0.5 ~ 2.5s | - | Ground Fault | Screw Terminal | 120/240VAC/DC | 8,812 | |
 PGR-4700-24 Hamlin / Littelfuse | 1 $1.0000 | CT Loop Monitoring, Harmonic Filtering, Manual Reset, Test Button | DIN Rail | - | 0 ~ 1.5s | 0.01 ~ 3A | Ground Fault | Screw Terminal | 24VDC | 8,016 | |
 SE-601-0D Hamlin / Littelfuse | 1 $1.0000 | Manual Reset, Test Button | Chassis Mount, DIN Rail | -40°C ~ 60°C | 0.5 ~ 2.5s | 0.1 ~ 0.2A | Ground Fault, Overcurrent | Screw Terminal | 12/24VDC | 3,643 | |
 SE-TA6 Hamlin / Littelfuse | 1 $374.0000 | - | Chassis Mount | - | - | - | Ground Fault | Screw Terminal | - | 5,058 | |
 777-LR-P2 Hamlin / Littelfuse | 1 $590.7900 | - | Chassis Mount | -20°C ~ 70°C | - | 200 ~ 480V AC | - | - | 200 ~ 480VAC | 4,598 | |
SE-701-0D Hamlin / Littelfuse | 1 $1.0000 | CT Loop Monitoring, Harmonic Filtering, Manual Reset, Test Button | DIN Rail | - | 0.05 ~ 2.5s | - | Ground Fault | Screw Terminal | 12 ~ 24VDC | 2,327 | |
 SE-135-00 Hamlin / Littelfuse | 1 $3.0000 | CT Loop Monitoring, Harmonic Filtering, Manual Reset, Test Button | Panel Mount | -40°C ~ 60°C | 0.1 ~ 2.5s | - | Ground Fault | Screw Terminal | 65 ~ 265VAC, 85 ~ 275VDC | 5,842 | |
 SE-330-03-00 Hamlin / Littelfuse | 1 $5.0000 | Harmonic Filtering, Manual Reset | Panel Mount | -40°C ~ 60°C | 0.1 ~ 10s | 20 ~ 10000VAC | Ground Fault | Screw Terminal | 120/240VAC/DC | 3,231 | |
 77C Hamlin / Littelfuse | 1 $384.1500 | - | Chassis Mount | -20°C ~ 70°C | - | 100 ~ 240V AC | - | - | 100 ~ 240VAC | 4,445 | |
 SE-107 Hamlin / Littelfuse | 1 $1.0000 | Automatic Reset, Manual Reset | Chassis Mount | - | 0.1 ~ 1s | 0.5 ~ 5A | Ground Fault | Screw Terminal | 120VAC | 1,343 | |
 PGR-4300-24 Hamlin / Littelfuse | 1 $1.0000 | Manual Reset, Test Button | Chassis Mount, DIN Rail | -10°C ~ 60°C | 0 ~ 1s | 100 ~ 1200A | Ground Fault | Screw Terminal | 24VDC | 1,870 | |
 AF0500-00 Hamlin / Littelfuse | 1 $3.0000 | - | Chassis Mount | -40°C ~ 70°C | - | - | Arc-Flash | Screw Terminal | 100 ~ 240VAC, 110 ~ 250VDC, 24 ~ 48VDC | 4,214 | |
 SE-325 Hamlin / Littelfuse | 1 $1.0000 | Manual Reset | Chassis Mount | - | 0.1 ~ 2s | 0.5 ~ 4A | Ground Fault | Screw Terminal | 120VAC | 4,648 | |
 777-575-P2 Hamlin / Littelfuse | 1 $590.7900 | - | Chassis Mount | -20°C ~ 70°C | 0 ~ 999s | 2 ~ 800A, 450 ~ 660VAC | Multiple | Screw Terminal | 500 ~ 600VAC | 6,524 | |
 777-575-KW/HP-P2 Hamlin / Littelfuse | 1 $681.8700 | - | Chassis Mount | -20°C ~ 70°C | 0 ~ 999s | 2 ~ 800A, 450 ~ 660VAC | Multiple | Screw Terminal | 500 ~ 600VAC | 1,702 | |
 777-LR-KW/HP-P2 Hamlin / Littelfuse | 1 $681.8700 | - | DIN Rail | -20°C ~ 70°C | 0 ~ 999s | 1 ~ 800A, 170 ~ 528VAC | Multiple | Screw Terminal | 200 ~ 480VAC | 5,940 |