Product Overview
Square D AR-2.71 Overload Heater Element, New Old Stock
Condition
This Square D AR-2.71 heater element is unused, new old stock, and in excellent condition, exactly as rated. The white ribbed coil is intact and wound cleanly around its core, and the two L-shaped mounting brackets with brass ring terminals photograph clean and undamaged. The AR-2.71 designation is stamped on the flat metal bracket face beside the brass eyelets, confirmed against the piece itself. Stock is one, so the unit photographed is the exact unit you receive.
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Product Overview
The Square D AR-2.71 is a thermal overload heater element, the low-resistance metal strip an overload relay uses to sense motor current. As current draw rises, the heater element generates heat that trips the relay's bimetal mechanism, opening the circuit to protect the motor from sustained overcurrent, without the one-time sacrificial trip a fuse delivers. This element is built around a white ribbed insulating body wrapped over the internal heating coil, terminating in two L-shaped metal mounting brackets fitted with brass ring terminals for connection into the relay's heater assembly. The AR-2.71 rating is stamped onto the flat metal bracket face beside the brass eyelets. Sold as a single unit, unused and new old stock.
Key Features
- Square D AR-2.71 thermal overload heater element
- White ribbed insulating body over internal heating coil
- Two L-shaped metal mounting brackets with brass ring terminals
- AR-2.71 rating stamped on the flat metal bracket face
- Condition: unused, new old stock
Applications
- Electricians replacing a worn or mismatched heater element in a Square D overload relay during motor protection maintenance
- Panel builders assembling or repairing motor control centers who need the exact AR-2.71 rating for a properly calibrated trip point
- Maintenance techs stocking a spare for a legacy Square D overload relay where OEM parts are hard to source
- Industrial facilities keeping a motor circuit protected against overcurrent without replacing an entire relay
Frequently Asked Questions
What does a thermal overload heater element do?
It is the sensing element inside an overload relay. As the motor draws current, the heater element heats in proportion, and that heat trips the relay's bimetal contacts to open the circuit before the motor sustains damage from prolonged overcurrent. Unlike a fuse, it does not sacrifice itself to interrupt current, it works with the relay to make the trip decision.
Will this AR-2.71 element fit my overload relay?
The AR-2.71 designation is stamped on the part itself. Match that number against the heater element table for your specific Square D overload relay before ordering. Not confirmed - verify against the datasheet before use if your relay isn't already specified for an AR-2.71 heater.
Is this heater element new or used?
Unused, new old stock. It has never been installed, and the photos show the piece exactly as it left inventory.
Why buy this one instead of a bulk lot of overload heaters?
We have exactly one AR-2.71 in stock, and it is the piece photographed here, not a promise pulled from a bin of mixed heater ratings. You get the confirmed AR-2.71 marking and a known, unused part instead of sorting through an assorted lot hoping for a match. Orders under $28 ship for an $8 flat rate, free once your order passes $28, and it leaves our Idaho warehouse the same or next business day.
A heater element never gets credit for what it prevents, only blamed if it fails to trip. Put this AR-2.71 to work in its relay and let it keep quiet watch over your next motor.
