Blue Sea's 187-Series DC circuit breakers combine manually resettable overcurrent protection with a switchable lever. They are used in some high-current battery and equipment circuits, but model numbers that look similar can have different current ratings and mounting configurations. This reference separates 7047, 7147, 7148 and 7049 by their manufacturer-defined distinctions and shows the matching parts listed at UsedRVParts.
Where a switchable breaker belongs in a protected circuit
A correctly selected DC circuit breaker is placed in series with the conductor it protects. A tripped 187-Series unit is designed to open automatically in an overcurrent event; its trip-free mechanism prevents the lever from holding the breaker ON during a fault. It does not charge batteries or distribute multiple separately protected outputs.
Source of the circuit and available fault current.
One switchable thermal trip device; trips open when its protection threshold and time requirements are met.
Positive conductor to equipment; the negative return is not depicted.
Identify by current rating and mounting style
| Model | Rating | Factory mounting | Common electrical characteristics |
|---|---|---|---|
| Blue Sea 7047 | 135A | Panel mount | 48V DC maximum; Type III switchable/manual-reset; 5/16 in–18 studs |
| Blue Sea 7147 | 135A | Surface mount | 48V DC maximum; Type III switchable/manual-reset; 5/16 in–18 studs |
| Blue Sea 7148 | 150A | Surface mount | 48V DC maximum; Type III switchable/manual-reset; 5/16 in–18 studs |
| Blue Sea 7049 | 200A | Panel mount | 48V DC maximum; Type III switchable/manual-reset; 5/16 in–18 studs |
For the 187-Series, Blue Sea specifies 75 in-lb (8.47 Nm) terminal-stud torque and an interrupt rating of 5,000A at 14V DC, 3,000A at 28V DC and 1,500A at 48V DC. Current rating and interrupt capacity are different specifications: the breaker must safely interrupt the prospective fault current of the actual battery bank.
Matching UsedRVParts 187-Series breakers
These images come from the corresponding store listings. Compare the model number on the original breaker with each part, then check the listing for current condition and availability. Viewing and pickup in Kelowna are by appointment where applicable.
Manufacturer specifications and dimensioned drawings
Use Blue Sea's original references to confirm replacement mounting geometry and installation requirements: 7047 135A panel mount, 7147 135A surface mount, 7148 150A surface mount and 7049 200A panel mount.