Power Relays

Power relays and contactors are the high-current switching devices that connect control logic to motors, heaters, lighting circuits, and other industrial loads. Enicstra stocks power switching components from Allen-Bradley, Schneider, Siemens, Eaton, Omron, Finder, and Phoenix Contact — current and discontinued part numbers used in installed equipment.

Coverage includes general-purpose power relays in 8-pin and 11-pin octal and blade formats; contactors rated from 9 A to 1,000+ A; reversing and combination starters; overload relays in thermal and electronic versions; and motor protection circuit breakers (MPCBs). Coil voltages span 12 VDC through 480 VAC. Every relay is bench-tested and backed by our 12-month functional warranty.

Power relay replacement requires matching the coil voltage, contact rating (AC-1 vs AC-3 vs DC-13), and the auxiliary contact configuration on your existing safety or interlock system. Send the OEM part code; most quotes return within 1–2 business days.

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Buying guide

Choosing Power Relays components

Power relay sizing has two layers that often get confused: the contact rating, and the utilization category. A contactor rated 50 A in AC-1 (resistive load) may only be rated 25 A in AC-3 (motor load) because of the higher inrush and inductive switching. Always size to the utilization category for your specific load.

Specifications to confirm before ordering:

Coil voltage (12 VDC, 24 VDC, 110 VAC, 230 VAC, 480 VAC)
Contact rating in the utilization category for your load (AC-1, AC-3, DC-13, etc.)
Load current and voltage
Number and type of main poles (3-pole for three-phase motors, 4-pole for switched neutral)
Number and type of auxiliary contacts (NO, NC)
Mounting style — DIN-rail, panel-mount, octal socket
Mechanical interlocks (for reversing starters)
Approvals (UL, CSA, CE)

Common types and applications:

General-purpose relays: 8-pin or 11-pin octal for control panel interfacing
IEC contactors: 9 A to 1000+ A for three-phase motor switching
NEMA contactors: standard frame sizes for North American motor applications
Reversing starters: two contactors with mechanical and electrical interlock
Mini contactors: compact 4-pole devices for small motor and heater control

For modern motor starting, an electronic overload relay paired with a contactor is more accurate than thermal overload, with adjustable trip class and self-diagnostics. Older thermal overload relays remain in service in many panels and are commonly sourced through us.

Related categories Frequently asked questions

Can you supply obsolete Allen-Bradley Bulletin 100 or Telemecanique LC1 contactors?

Yes. Legacy contactors from the major IEC and NEMA platforms — including A-B Bulletin 100/700, Telemecanique LC1/LC2, Siemens 3RT, and Eaton XT — are some of our most common requests. Send the part number for availability.

Can I substitute a Schneider contactor for an Allen-Bradley?

Often functionally, yes — the main poles will switch the same load if sized correctly. The auxiliary contact configuration, mounting hole pattern, and terminal labeling are different, so panel changes may be needed. For drop-in replacement, match the original manufacturer.

What's the difference between AC-1, AC-3, and DC-13?

These are utilization categories defining how the contacts handle different load types. AC-1 is purely resistive (heaters, distribution); AC-3 is squirrel-cage motor switching with inrush and breaking under load; DC-13 is DC electromagnet control. Always size to the right category for your load type.

Are power relays new, surplus, or used?

Most stock is new-old-stock — unused, often in original packaging. Some legacy contactors and starters come from tested system removals. Each product page lists condition where known.

Do you stock motor protection circuit breakers (MPCBs)?

Yes — MPCBs combine short-circuit protection with motor overload protection in one device, replacing the separate fuse-plus-overload arrangement. We carry Schneider GV2, Eaton PKZM, Siemens 3RV, and similar models.