Littelfuse 460 Series 3-Phase ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
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Littelfuse 460 Series 3-Phase Voltage Monitor Relay, 190-480VAC Input

Littelfuse 460 Series 3-Phase Voltage Monitor Relay, 190-480VAC Input

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Model: LIT460

In Stock (leaves warehouse same day if ordered before 3pm ET)

$0.53
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Littelfuse 460 Series 3-Phase Voltage Monitor Relay, 190-480VAC Input

The Littelfuse 460 Series 3-Phase Voltage Monitor Relay is a microcontroller-based voltage and phase-sensing device that continuously monitors 3-phase power lines for low, high, and unbalanced voltage, loss of any phase, and phase reversal. Built for a 190 to 480VAC input range, the relay trips its output on an adjustable 1-30 second delay and restarts after a 1-500 second delay once line conditions stabilize, with a 2-8% adjustable voltage unbalance trip point to prevent nuisance tripping from fluctuating lines. The finger-safe IP20 NEMA 1 enclosure suits panel-mount installation in commercial and industrial power systems.

Key Features

  • Input Voltage: 190 to 480VAC 3-phase input for broad compatibility with commercial and industrial power systems.
  • Adjustable Trip Delay: 1-30 second adjustable trip delay for over, under, and unbalanced voltage conditions; single-phase faults above 25% unbalance trip in a fixed 1 second.
  • Adjustable Restart Delay: 1-500 second adjustable restart delay ensures the output only reactivates once line conditions are stable.
  • Voltage Unbalance Trip Point: 2-8% adjustable unbalance trip point with reset at trip setting minus 1% (5-8% range) or minus 0.5% (2-4% range).
  • Output Contact Rating: One Form C contact rated Pilot Duty 480VA @ 240VAC B300 or General Purpose 10A @ 240VAC.
  • Finger-Safe Enclosure: IP20 NEMA 1 finger-safe enclosure for added installer and technician safety.
  • Operating Temperature: -40° to 70°C (-40° to 158°F) for reliable performance across demanding ambient conditions.
  • Termination: Stranded or solid 12-20AWG wire, one conductor per terminal, torqued to 6 in-lbs.

Certifications & Compliance

  • IP20 Rated, Finger-Safe Enclosure
  • NEMA 1 Protection Class

Technical Specifications

  • Voltage Rating: 190-480VAC
  • Amperage Rating: 10A
  • PDF: Spec Sheet: https://media.distributordatasolutions.com/littelfuse/2023q3/documents/f6097e8388c649ccb316fa6e0b23289c04769a73.pdf

Typical Applications

  • 3-Phase Motor and Equipment Protection
  • Commercial and Industrial Power Distribution Panels
  • Pump and Compressor Control Circuits
  • HVAC and Process Equipment Voltage Monitoring
  • Panelboard and Control Panel Installations

Typical Applications

Why Littelfuse?

Littelfuse builds the 460 Series with a finger-safe IP20 NEMA 1 enclosure, giving panel builders and electricians a rugged voltage and phase monitor for 3-phase power systems. Adjustable trip and restart delays let technicians tune the relay to the application, while the Form C output rating supports both pilot duty and general purpose control circuits for dependable, code-conscious protection.

Product Specs

Product Type:
Voltage Monitor Relay
Voltage Rating:
190-480VAC
Amperage Rating:
10A
Standards:
NEMA 1
Product Material:
Epoxy Substrate
Configuration:
3-Phase
Series:
460 Series
Department:
Electrical
Product Group:
Wiring Devices

Littelfuse LIT460 – Frequently Asked Questions

1) Will a Littelfuse 460 Series voltage monitor work on a 208V 3-phase panel, or is it only for 480V?
The 460 Series covers a 190 to 480VAC 3-phase input range, so it works on 208V, 240V, 400V and 480V systems without changing models. That single wide range is why panel builders use it across mixed-voltage facilities instead of stocking separate monitors per voltage.
2) What faults does the Littelfuse 460 3-phase monitor relay actually trip on?
It watches for low voltage, high voltage, voltage unbalance, loss of any phase, and phase reversal. Phase reversal protection matters on pumps and compressors, where a rotation swap after utility work will run the motor backwards. The relay is microcontroller based and monitors continuously rather than sampling on start.
3) Can I switch a motor starter coil directly with the 460 Series relay, or do I need an interposing relay?
The output is one Form C contact rated Pilot Duty 480VA at 240VAC B300, or General Purpose 10A at 240VAC. A B300 pilot duty rating covers typical magnetic starter and contactor coils directly, so most control circuits need no interposing relay. For larger inductive loads beyond that rating, use it to drive a contactor instead.
4) How do I stop a 3-phase voltage monitor from nuisance tripping on a fluctuating utility line?
Two adjustments handle that on the 460 Series. The unbalance trip point sets anywhere from 2 to 8 percent, so you can back it off on a line that normally runs a little uneven, and the trip delay adjusts from 1 to 30 seconds so brief sags ride through. Reset happens at the trip setting minus 1 percent on the 5-8 percent range, or minus 0.5 percent on the 2-4 percent range. One thing you cannot delay: a single-phase fault above 25 percent unbalance trips in a fixed 1 second.
5) Can I set a restart delay long enough to protect a compressor from short cycling?
The restart delay is adjustable from 1 to 500 seconds, which is over 8 minutes. That is enough to cover the head-pressure equalization time most refrigeration compressors need before a restart attempt, and it holds the output off until line conditions have actually stabilized.
6) What wire size do the terminals on the Littelfuse 460 take, and what is the torque spec?
Terminals accept 12 to 20AWG stranded or solid, one conductor per terminal, torqued to 6 in-lbs. If you need to land two conductors on a point, pigtail them outside the device rather than doubling up in the terminal.
7) Is this voltage monitor safe to mount in an open control panel with live parts nearby?
The enclosure is IP20 finger-safe and rated NEMA 1, which is the reason it gets specified for panel mounting where techs are working in a live cabinet. NEMA 1 is indoor, general purpose only, so it is not a washdown or outdoor-rated device on its own; in a wet or dusty location it belongs inside a suitably rated enclosure.
8) Which Littelfuse part number do I order for the 460 Series voltage monitor?
Three model numbers are offered under the 460 Series: 460, 429-015, and 101003. Order by the model number your drawing or existing panel calls out, since the number on the device is what a future tech will match against.
9) Will this relay hold up in an unheated mechanical room or a rooftop panel?
Operating range is -40 to 70 degrees C (-40 to 158 degrees F), so unheated mechanical spaces, cold-climate pump houses, and hot rooftop control panels are all inside the window. Construction uses an epoxy substrate.
How fast can I get the Littelfuse LIT460 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Littelfuse LIT460 come with a warranty?
Absolutely. The Littelfuse LIT460 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Littelfuse LIT460?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Littelfuse LIT460 from ZenSupply?
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