Product Overview
Allen-Bradley N11 Type N Heater Element for Legacy Motor Overload Relays
Condition
Unused, New Old Stock. The photographed piece is representative of current stock: a light tan spool with a hollow center, a flat stamped metal tab on one side carrying the N11 marking, and a thin lead ending in a small eyelet on the other, both eyelets brass colored. Against the rule in the photos the spool body measures approximately half an inch across and the assembly spans roughly an inch and a half from eyelet to eyelet. No scorching, distortion or heat discoloration is visible in these frames. The only legible marking on the sample is the N11 stamp on the tab.
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Product Overview
The N11 is a Type N thermal overload heater element from the legacy Allen-Bradley N-Series, the calibrated part that sits in a magnetic motor starter's overload relay and turns motor line current into heat. Construction is simple and plain in the photos: a resistance element carried on a hollow non-metallic spool, terminated at a flat stamped tab on one side and a thin lead with a small eyelet on the other, both eyelets sized to land under the relay block's terminal screws. In service that heat warms the relay's bimetal or eutectic mechanism until the calibrated trip point releases the contacts, giving inverse-time protection that follows a motor's own thermal behavior instead of cutting out on normal inrush. The number stamped on the tab is the whole specification: every N-number shares this same body form but carries a different electrical calibration, so the heater is selected from the published Allen-Bradley heater table against motor nameplate full-load amps and the specific starter and relay frame, never from horsepower alone and never by eye. The amp range tied to the N11 is not confirmed here - verify against the heater selection table before use. Sold each, and stock is limited.
Key Features
- Allen-Bradley Type N thermal overload heater element, N11 stamped on the terminal tab
- Two eyelet terminals, one on a flat stamped tab and one on a thin lead, sized for relay terminal screws
- Resistance element carried on a hollow non-metallic spool, light tan body with brass colored eyelets
- Spool body approximately half an inch across, roughly an inch and a half overall across the terminals, measured against the rule in the photos
- Gives inverse-time motor overload protection rather than instantaneous interruption
- Each N-number is separately calibrated; the shared body form does not make them interchangeable
- Trip current range not confirmed - verify against the Allen-Bradley heater selection table before use
- Unused New Old Stock, sold each
Applications
- Maintenance electrician putting a legacy Allen-Bradley NEMA starter back to the heater callout on its own nameplate
- Panel shop rebuilding an overload relay block in a motor control center bucket and wanting matched heaters across all three poles
- Machine restorer keeping the original magnetic starter on a lathe or mill instead of retrofitting a modern electronic overload
- Plant storeroom restocking a spares drawer for older N-Series starters that are still running every shift
Frequently Asked Questions
What does the N11 number actually specify?
It is a factory calibration code, not an amp rating you read off directly. The correct heater is chosen from the Allen-Bradley heater selection table using the motor's nameplate full-load current together with the specific starter and relay frame it drops into. The published range for the N11 is not confirmed here - verify against the heater table before use.
Will any Type N heater work if it physically fits?
No, and that is the trap. Type N heaters share a common physical form factor and a similar mounting style, which is exactly what makes the wrong one easy to install. Each N-number is calibrated differently, and a mismatch shows up either as nuisance tripping or as a motor that is not actually protected.
What can you confirm about this heater from the photos?
N11 is stamped on the flat terminal tab, the body is a light tan spool with a hollow center, and there are two brass colored eyelet terminals, one on the stamped tab and one on a thin lead. Against the rule the spool is roughly half an inch across and the whole assembly spans about an inch and a half. Nothing in frame shows scorching, distortion or heat discoloration, and the stock is unused. What the photos cannot show is the internal calibration, so match the N11 to the heater table rather than to the picture.
Can I order just the number of heaters my starter needs?
Yes, and that is why these are listed individually. A three-pole starter takes three matched heaters, a single-phase starter usually takes one or two, and a storeroom rebuild often wants one spare on the shelf, so you buy that count instead of bidding on a mixed lot of fifty N-numbers where forty-nine of them are the wrong calibration. Stock here is limited, so the count shown available is the count we have. Shipping is $8 flat rate, free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
In a magnetic starter, the heater is the one part built to lose its temper before the motor does, and this little spool has spent years on a shelf waiting for the chance. Match the N11 to what the nameplate calls for, and the relay goes back to watching the motor for you.
