Product Overview
Line Electric HKH3A 115V Industrial Automation Switching Relay
Condition
Unused new old stock in clean physical condition. Markings stamped on metal cover: HKH3A, 115VAC, with wiring schematic diagram and Line Relays logo; base flange stamped K24. Terminals are clean and straight with no signs of installation. Sold each.
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Product Overview
Line Electric Company HKH3A is a heavy-duty electromechanical plug-in relay designed for industrial control panels, automation machinery, and logic switching circuits. Built with an 11-pin circular base and a durable metal dust enclosure, this relay features a 3PDT (3 Form C) contact arrangement rated for 10 amps resistive at 120 VAC. The 115 VAC coil allows direct integration into standard line-voltage control loops without requiring step-down transformers or auxiliary DC supplies. A clear schematic diagram stamped directly on the enclosure face identifies terminal assignments for immediate field wiring verification.
Key Features
- Coil Voltage: 115 VAC, 50/60 Hz
- Contact Configuration: 3PDT (3 Form C)
- Contact Rating: 10 A at 120 VAC resistive
- Base Type: 11-pin circular plug-in with keyed center guide post
- Enclosure: Protective metal dust cover with stamped schematic diagram
- Terminal Connections: Coil across pins 1 and 11; three independent Form C contact sets across pins 2-10
Applications
- Interlocking safety circuits and motor control circuits in industrial machinery panels
- Replacing worn plug-in relays in legacy HVAC control assemblies and packaging equipment
- Benchtop automation projects and custom machine builds requiring multi-pole AC switching
- Makers restoring vintage electrical apparatus, pinball machines, or electromechanical sequencing panels
Frequently Asked Questions
What are the coil operating voltage specifications?
The coil is rated for 115 VAC at 50/60 Hz, operating across standard nominal 110V to 120V AC control loops.
Can this relay be used in place of a DPDT relay?
The 3PDT configuration provides three separate Form C sets. It can replace a DPDT relay if the circuit matches the 11-pin circular pinout, leaving the third contact set disconnected.
What socket type is required to install this relay?
This relay plugs into a standard 11-pin circular octal-style relay socket with an 11-pin pattern and a keyed center alignment slot.
There is a reassuring permanence to an all-metal relay with its schematic stamped right on the case. Plug it into your socket and let the machinery get back to work.
