Blue Sea Systems 12V ML Series Remote Battery Switch with Manual Control BSS-7700
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Blue Sea Systems 7700, commonly sold in dealer listings as 7700-BSS, is a genuine ML-Series Remote Battery Switch with Manual Control for 12V DC systems. Blue Sea identifies it as a 500A magnetic-latching remote battery switch that can be operated manually or from remote locations, with a manual override knob that also provides LOCKED OFF capability for servicing.
Key Features
- Genuine Blue Sea Systems OEM part number 7700 / 7700-BSS.
- 12V DC ML-Series remote battery switch with manual control.
- 500A continuous rating, 700A for 5 minutes, 1100A for 1 minute, and 2500A for 10 seconds.
- Magnetic latching bi-stable design draws 0mA in the ON or OFF state and draws current only when changing state.
- Includes 2145 SPDT Remote Control Contura Switch.
- 3/8"-16 tin-plated copper studs with 7/8 in. (22 mm) stud length for multiple cable terminals.
- Rated IP66 and meets ISO 8846 and SAE J1171 ignition-protection standards.
- Approximate weight 2.05 lb (0.93 kg).
Engine Compatibility
This is not an engine-specific part. The 7700 is selected by battery-bank layout, system voltage, cable size, and switching requirements rather than by engine make or model. Blue Sea positions it for high-amperage battery switching for engine, inverter, house loads, and emergency battery combine functions in marine electrical systems.
Serial Number Fitment Notice
Match this switch by electrical-system requirements rather than by engine serial number. The key checks are 12V DC system voltage, required current capacity, cable size, stud size, mounting space, and whether the installation calls for a remote battery switch with manual override instead of a standard manual battery switch or a different ML-Series variant.
When This Part Needs Replacement
Replace this switch when the existing battery switch no longer changes state reliably, the manual override is damaged, the contacts have failed under load, or the installation needs a higher-quality remote battery switching setup with lock-off capability. This replacement guidance is a practical service inference based on Blue Sea's stated use of the 7700 for high-amperage switching under load in marine battery-management systems.
Installation Notes
Install the 7700 only after confirming the correct 12V control circuit, cable size, current load, and mounting arrangement. Blue Sea's current specifications call for 2x 4/0 cable to meet ratings, 140 in-lb (15.82 Nm) terminal stud torque, and #10 mounting hardware, and the retail 7700 version uses tinned-wire control leads.
Alternate/Superseded Part Numbers
Current sources show 7700 and 7700-BSS as the standard retail part-number formats for this same switch. Related ML-Series variants include 7700100 for the bulk version with Deutsch/Amphenol-style connection, and 7702 / 7702100 for the 24V versions. These are related family references, not direct substitutes unless the system requirements match.
Parts Desk Insight
With remote battery switches, the most important match is the system voltage and current requirement, not just the overall shape of the switch body. For the 7700, confirming 12V, 500A continuous capacity, and the need for manual override with lock-off will usually save more trouble than comparing switches by appearance alone.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.