# DigiKey Part Number 277-17838-ND Voltage Rating

**URL:** <https://forum.digikey.com/t/digikey-part-number-277-17838-nd-voltage-rating/53759>\
**Category:** Circuit Protection\
**Tags:** circuit-breakers, documentation, phoenix-contact\
**Created:** [April 17, 2025, 2:58pm UTC](https://forum.digikey.com/t/digikey-part-number-277-17838-nd-voltage-rating/53759 "2025-04-17T14:58:37Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![jose.pina](https://avatars.discourse-cdn.com/v4/letter/j/c57346/32.png) [@jose.pina](https://forum.digikey.com/u/jose.pina)\
**Post date:** [April 17, 2025, 2:58pm UTC](https://forum.digikey.com/t/digikey-part-number-277-17838-nd-voltage-rating/53759/1 "2025-04-17T14:58:37Z")

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Hi, I have a question in regards this specific [Circuit Protection]

[1019998 Phoenix Contact | Circuit Protection | DigiKey](https://www.digikey.com/en/products/detail/phoenix-contact/1019998/9656109)

**Voltage Rating - DC 125 V**

What is meant by this voltage rating? Is the maximum operating voltage meant here?

Does this item have a defined range of operation, for example, 12 to 125 VDC?

If yes, will circuit breaker protection be full effective within this changeable range of operation?

Thanks,  
JJ Pina

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**Author:** ![anthony\_14117](https://avatars.discourse-cdn.com/v4/letter/a/6a8cbe/32.png) [@anthony\_14117](https://forum.digikey.com/u/anthony_14117)\
**Post date:** [April 17, 2025, 4:09pm UTC](https://forum.digikey.com/t/digikey-part-number-277-17838-nd-voltage-rating/53759/2 "2025-04-17T16:09:46Z")

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Hello @jose.pina

Welcome to the TechForum

Yes, you are correct, the voltage rating is the max voltage the circuit breaker can tolerate before damage will be done to the circuit breaker.  
There is no defined range of operations for the voltage as long as you are at or below the circuit breaker voltage rating as the circuit breaker is looking for a surge in the current above its current rating.

I have included a few TechForum post that can explain more about circuit breakers attributes and their operation.  
[Circuit Breakers - Resources / Product Selection Guide, DigiKey TechForum](https://forum.digikey.com/t/circuit-breakers/32280)

[Circuit breakers, DigiKey TechForum](https://forum.digikey.com/t/circuit-breakers/667)

[What’s inside a circuit breaker? An introduction to the thermal and magnetic trip, DigiKey TechForum](https://forum.digikey.com/t/what-s-inside-a-circuit-breaker-an-introduction-to-the-thermal-and-magnetic-trip/52200)

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**Author:** ![jose.pina](https://avatars.discourse-cdn.com/v4/letter/j/c57346/32.png) [@jose.pina](https://forum.digikey.com/u/jose.pina)\
**Post date:** [April 17, 2025, 7:57pm UTC](https://forum.digikey.com/t/digikey-part-number-277-17838-nd-voltage-rating/53759/3 "2025-04-17T19:57:57Z")

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Thank you very much!

JJ Pina