Antique metal stip circuit breaker

[kmorris8]

Looking for info on an old circuit breaker from 1937 that uses a metallic-strip. It's a very simple device that uses, I assume, a metal strip (bi-metal I assume) that heats up with current, bends, and eventually pops open. No manufactturer markings. i'll post a picture if I can figure out how.

[Fox's Mercantile]

Post by kmorris8
Looking for info on an old circuit breaker from 1937 that uses
a metallic-strip. It's a very simple device that uses, I assume,
a metal strip (bi-metal I assume) that heats up with current,
bends, and eventually pops open. No manufactturer markings.
I'll post a picture if I can figure out how.

Are they the ones the are the same size as a 3AG cartridge fuse?
1/4" in diameter and 1" or so long. With the metal snap strip on
one side that pops open with an overload.

They were VERY popular with the Model Railroad guys.

[philo]

Post by kmorris8
Looking for info on an old circuit breaker from 1937 that uses a metallic-strip. It's a very simple device that uses, I assume, a metal strip (bi-metal I assume) that heats up with current, bends, and eventually pops open. No manufactturer markings. i'll post a picture if I can figure out how.

I repaired industrial battery chargers for a living and some of the
really old ones used thermal breakers.


Chargers eventually stopped using them and went to fuses only.


The old battery chargers used selenium rectifiers so did not suffer
dead-shorts as silicon diodes could.