BT1-B2-14-640-521-MT
Littelfuse Inc.
The Littelfuse Inc. BT1-B2-14-640-521-MT is a panel mount circuit breaker. It features a 40A current rating and a 277V voltage rating.
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The Sensata APL1-1REC4-52-403-M is a hydraulic magnetic circuit breaker from the APL/UPL series. This single-pole unit is designed for reliable power switching and circuit protection, operating similarly to an ON-OFF switch under normal load conditions. Upon overload, its internal mechanism trips, forcibly opening the contacts and returning the handle to the OFF position. The protector is "trip free," meaning it cannot be held closed during an overload.
Key electrical specifications include a current rating of 40A and a voltage rating of 277V. It features a lever actuator for manual operation and is designed for panel mounting. This is a legacy product, and Sensata Technologies recommends the Airpax™ IAL series for new design-ins.
The APL/UPL series is recognized by UL per UL STD. 1077 as supplementary protectors and certified by CSA per CSA STD. C22.2–No. 235. While designed for industrial, military, and information processing applications, it is suitable for any situation requiring precision operation.
| Qty | Low | High |
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| 1+ | $0.99 | $0.99 |
Estimated market price range - modelled values for guidance only, not live distributor offers.
The current rating is 40A.
The voltage rating is 277V.
This circuit breaker has 1 pole.
It is a Magnetic (Hydraulic Delay) type breaker.
The mounting type is Panel Mount.
Yes, the APL/UPL series is a legacy product and no new design-in orders are being accepted.