Littelfuse 460L-OEM 3-Phase Voltage Monitor, 190-480V Adj

Erik Prayoga — Sun, 21 Jun 2026 13:44:32 +0000

The Littelfuse 460L-OEM is a three-phase voltage monitoring relay for 190-480 VAC systems, providing adjustable undervoltage, overvoltage and phase-unbalance protection. This DIN-rail voltage monitor delivers pilot and general-purpose outputs, configurable trip/restart delays and reliable trip accuracy, making it ideal for motor control, generator sets and industrial power panels. It features ±1% trip accuracy, a 6% unbalance trip point and single-phase fault detection with a fixed 4 s delay.

Key Features

Universal supply 190-480 VAC for three-phase industrial power systems.
Pilot duty output 480 VA @240 V (B300) plus general-purpose 10 A @240 V.
Adjustable trip delays (1-30 s) and wide restart delay range (1-500 s).
Undervoltage trip 90% (reset 93%), overvoltage trip 110% (reset 107%).
±1% trip accuracy, 6% unbalance trip point and single-phase fault fixed 4 s delay.
DIN-rail mount, torque termination (6 in-lbs) for 12-20 AWG; IP20 / NEMA 1 housing with 10-95% non-condensing humidity rating.

Technical Specifications

Manufacturer	Littelfuse
Commercial Reference	460L-OEM
Component	Voltage Monitoring Relay
Mounting	DIN Rail
Supply Voltage	190-480 V AC
Frequency	50/60 Hz
Output Ratings	Pilot duty 480 VA @240 V (B300); General-purpose 10 A @240 V
Trip / Reset Points	Undervoltage trip 90% (reset 93%); Overvoltage trip 110% (reset 107%); Unbalance trip 6% (reset 4.5%)
Delays	Trip delay 1-30 s (adjustable); Single-phase fault fixed delay 4 s for >25% unbalance; Restart delay 1-500 s (adjustable)
Accuracy	Trip point accuracy ±1%
Termination	Torque terminals 6 in-lbs; accepts 12-20 AWG stranded or solid
Power Consumption	Maximum input power 6 VA
Environment & Protection	IP20 / NEMA 1, 10-95% non-condensing humidity

Applications

Used for motor control centers, air compressor and pump protection, generator and transfer-switch supervision, industrial distribution panels and HVAC systems where phase balance and voltage quality must be monitored at the panel or equipment level.

All units are genuine Littelfuse products supplied through authorized channels. Based in Batam, Deddy Susanto ships quickly across Indonesia and Southeast Asia. Contact us for availability, lead time and a competitive quotation — our sales and technical team can help specify the correct voltage monitoring relay for your installation.

Littelfuse 460-OEM 3-Phase Voltage Monitor, 190-480V Adj

Erik Prayoga — Sun, 21 Jun 2026 13:44:32 +0000

The Littelfuse 460-OEM is a 3‑phase voltage monitoring relay (Commercial Reference 460-OEM) with a wide input range of 190–480 VAC. Designed to detect under‑ and over‑voltage, phase loss and voltage unbalance, it provides adjustable trip thresholds and delays to protect motors, contactors and three‑phase equipment. With pilot‑duty and general‑purpose contact ratings, this voltage monitoring/protection relay is suitable for motor control panels, generator/transfer‑switch supervision and industrial automation requiring reliable voltage protection.

Key Features

Wide input range 190–480 VAC for flexible three‑phase monitoring
Adjustable under/over and unbalance trip points with ±1% accuracy
Pilot duty 480 VA @240 V (B300) plus 10 A general‑purpose contact capability
Adjustable restart delay (1–500 s) and configurable trip delays; 1 s fixed delay for single‑phase faults >25% unbalance
Compact DIN‑rail mounting with IP20 / NEMA 1 (finger safe) protection
Low input power consumption (~6 VA) and standard screw termination for 12–20 AWG wire

Technical Specifications

Manufacturer	Littelfuse
Commercial Reference	460‑OEM
Component	Voltage Monitoring Relay (3‑Phase)
Relay Mounting	DIN Rail
Input / Coil Voltage Rating	190–480 V AC
Frequency	50/60 Hz
Pilot Duty Rating	480 VA @ 240 V (B300)
General‑Purpose Contact	10 A @ 240 V
Maximum Input Power	≈ 6 VA
Undervoltage Trip / Reset	Trip 90% / Reset 93%
Overvoltage Trip / Reset	Trip 110% / Reset 107%
Trip Point Accuracy	±1%
Voltage Unbalance Trip	Adjustable 2–8%; single‑phase faults >25% have 1 s fixed delay
Trip Delay	Adjustable for under/over and unbalance conditions
Restart Delay	Adjustable 1–500 s
Terminals / Wire	Stranded or solid, 12–20 AWG; torque 6 in‑lbs
Humidity	10–95% (non‑condensing)
Protection Class	IP20 / NEMA 1 (finger safe)

Applications

Typical uses include protection of three‑phase motors and motor starters against under/over‑voltage and phase loss; monitoring generator sets and automatic transfer switches; safeguarding pumps, compressors and HVAC three‑phase loads from voltage unbalance; and integration into industrial control panels, conveyors and process equipment for reliable voltage supervision.

We supply genuine Littelfuse products through authorized channels. Based in Batam, we deliver fast across Indonesia and Southeast Asia with competitive pricing. Contact us to request a quotation or confirm stock and lead time for part 460‑OEM.

Monitoring Relays – Erik Prayoga

Littelfuse 460L-OEM 3-Phase Voltage Monitor, 190-480V Adj

Key Features

Technical Specifications

Applications

Littelfuse 460-OEM 3-Phase Voltage Monitor, 190-480V Adj

Key Features

Technical Specifications

Applications