Product Overview
Line Electric 11-Pin Circular Base Electromechanical Relay 120VAC
Condition
Unused new old stock (NOS). Evaluation: Visual inspection only. Function testing not performed. Markings legible: 3PDT diagram, HKH-3A, 120 VAC, 10 AMP 120 VAC, LINE ELECTRIC. Solid metal enclosure and base pins show no signs of prior installation or socket wear.
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Product Overview
G. General Electro-Components model HKH-3A (Line Electric Products) is a heavy-duty electromechanical control relay housed in a sealed metal can. Built with an 11-pin circular plug-in base and center keyed alignment post, it provides three-pole double-throw (3 Form C) switching rated for 10 amps at 120 VAC. Designed for standard socket mounting in industrial automation panels, machine controls, and electrical cabinets, it enables fast servicing without disturbing field wiring.
Key Features
- Contact configuration: 3PDT (3 Form C, Three Pole Double Throw)
- Contact rating: 10 A at 120 VAC resistive
- Coil voltage: 120 VAC
- Base type: 11-pin circular plug-in base with keyed guide post
- Enclosure: Sturdy protective metal can housing
- Face schematic: Factory-stamped wiring diagram showing coil terminals on pins 1 and 11 with 3 independent changeover contact sets
Applications
- Maintaining or restoring legacy industrial control cabinets, machine tool logic, and motor interlocks.
- Replacing failed plug-in relays in HVAC, pump sequencing, and material handling systems without rewiring socket terminations.
- Building electromechanical bench sequencers, hobbyist automation panels, or heavy-duty maker projects requiring isolated 3-pole AC switching.
Frequently Asked Questions
What socket does this relay plug into?
It mates with standard 11-pin circular relay sockets featuring an 11-hole arrangement around a center keyed slot.
Which pins connect to the coil?
The 120 VAC coil connects across pin 1 and pin 11, as indicated on the face diagram.
What contact configuration does the HKH-3A provide?
This model features a 3PDT (three-pole double-throw) contact arrangement providing three independent changeover circuits.
How do I tell the HKH-3A apart from 8-pin relays in the same line?
The HKH-3A uses an 11-pin circular base to accommodate its three full sets of Form C contacts, whereas 8-pin models provide only two poles (DPDT).
Before solid-state logic took over the cabinet, industrial sequencing lived inside stout metal cans like this. Plug it into the socket, hear that reassuring mechanical snap, and let the machine get back to work.
