Product Overview
Carlingswitch C Series Hydraulic Magnetic Circuit Breaker, 30 Amp, 1 Pole, with Auxiliary Switch
Condition
Used, clean and in good condition. The black molded case shows light handling scuffs and a few fine surface marks, the plated stud terminals look bright with no visible corrosion, and the three auxiliary pins are gold colored and straight. The white toggle handle is marked 30A; it is shown as found and has not been actuated or tested. The factory label is intact and readable, slightly yellowed, with one corner lifted at the top edge. It reads CA1-B2-34-630-311-C, FL. AMP 30, MAX VOLTS 80 DC and 277, HERTZ DC 50/60, DELAY 34, TRIP AMPS 40.5, along with 564-0301-1, 9805, MEXICO, and LOAD and LINE terminal callouts, plus UL and CSA marks. The back of the case is molded CARLINGSWITCH, INC. with U.S. patents 4,347,488, 4,504,807 and 4,760,226. Sold as a single breaker; the unit photographed is representative of our stock. Sold untested.
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Product Overview
This is a Carlingswitch C Series hydraulic magnetic circuit breaker, part number CA1-B2-34-630-311-C, rated 30 amps in a single pole. The label gives maximum volts of 80 DC and 277, hertz of DC and 50/60, a delay code of 34, and trip amps of 40.5. Hydraulic magnetic breakers trip on current through a solenoid coil damped by a fluid filled tube rather than on the heat of a bimetal strip, so the trip point holds steady whether the panel is cold or hot - which is why they turn up in telecom racks, marine panels, generators and mobile equipment. This unit carries a three pin auxiliary switch block on the bottom face, plainly marked NC, C and NO, for status or alarm signalling back to a controller. Power connections are two threaded stud terminals, one per side, with the label identifying LINE and LOAD. Carling Technologies is now part of Littelfuse; the case here is molded with the older CARLINGSWITCH, INC. name and three U.S. patent numbers, and the label shows MEXICO manufacture with a 9805 marking and the secondary number 564-0301-1.
Key Features
- Part number: CA1-B2-34-630-311-C (printed on the factory label)
- Type: hydraulic magnetic circuit breaker, C Series
- Full load amps: 30
- Poles: 1
- Max volts: 80 DC / 277
- Hertz: DC, 50/60
- Delay code: 34
- Trip amps: 40.5
- Auxiliary switch: three pin block marked NC, C and NO
- Power terminals: two threaded studs, label marked LINE and LOAD
- Handle: white toggle marked 30A
- Additional label markings: 564-0301-1, 9805, MEXICO, UL and CSA marks
- Case markings: CARLINGSWITCH, INC., U.S. patents 4,347,488 / 4,504,807 / 4,760,226
Applications
- Marine electrician rebuilding a DC distribution panel who needs a 30 amp branch breaker that trips the same in a cold bilge as in a hot engine room
- Telecom technician maintaining a legacy 48 VDC power frame and matching an existing Carling C Series position rather than redrilling the panel
- Generator and mobile equipment service tech replacing a failed breaker in an older control box where the original part number is still stamped on the panel legend
- Controls builder who wants the auxiliary NC / C / NO contacts wired back to a PLC input so the panel reports a tripped breaker instead of going quietly dark
Frequently Asked Questions
What do the three small pins on the bottom do?
They are an auxiliary switch, molded and marked NC, C and NO right on the block. They are a dry signalling contact, not a second power path - typical use is a trip indicator lamp or a controller input. The auxiliary contact rating is not printed on this label, so verify it against Carling C Series documentation for your part number before you wire it.
What does DELAY 34 mean, and how does it relate to TRIP AMPS 40.5?
34 is the Carling delay curve code printed on the label, and 40.5 is the trip amps figure printed alongside it. We are quoting the label, not a test result. If your application depends on a specific time-current curve, check the code against the manufacturer's published C Series curve data before you install.
Which terminals are line and which are load?
The factory label carries LOAD on the left and LINE on the right as you read the label face, next to the two threaded stud terminals. Follow the label on the unit you receive rather than the orientation of any photo.
Has this breaker been tested, and what exactly am I getting?
It is a used breaker, clean and in good condition, and it is sold untested - we do not put a current source on these, so no trip time, no calibration and no continuity result is being claimed. What we do offer is a fully photographed part: the label ratings, the patent-marked case, the auxiliary block and the terminal studs are all in the images, so you can confirm the exact number and configuration before you buy instead of gambling on an unphotographed panel pull. The photos show a representative unit from our stock and you are buying one breaker; meter it and bench trip it before it protects anything that matters. Shipping is $8 flat rate and free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
A hydraulic magnetic breaker decides when to let go with a coil and a damping tube, not with a strip of metal guessing at room temperature - which is why the cold, hot and shaking corners of the world kept buying them. Put this one back in the panel it was built for and let it go back to waiting.
