Single Circuit ON-OFF with Locking Key – Black
300 Amps continuous rating for outboards and small gasoline or diesel engines
- Tin-plated copper studs for maximum conductivity and corrosion resistance
- Studs accept 3/8″ (M10) ring terminals
- 7/8″ (22 mm) stud length accepts multiple cable terminals
- Blue Sea Systems one-piece terminal stud design never loosens over time
- One-piece stainless flange nuts ensure safe and secure connections
- Isolating cover protects rear contacts
- Breakout tabs allow wire access in any direction
Specifications:
- Switch Type: Single Circuit ON-OFF
- Color: Black
- Maximum Voltage: 48V DC
- Continuous Rating: 300A
- Intermittent Rating: 500A
- Cranking Rating 30 sec: 900A

![blue-sea-6004200-single-circuit-on-off-w-locking-key-black-6004200 Blue Sea 6004200 Single Circuit ON-OFF w/Locking Key – Black [6004200]](https://www.crankbaitt.com/wp-content/uploads/2025/8/1756613396/blue-sea-6004200-single-circuit-on-off-w-locking-key-black-6004200.webp)
![blue-sea-6004200-single-circuit-on-off-w-locking-key-black-6004200_1 Blue Sea 6004200 Single Circuit ON-OFF w/Locking Key – Black [6004200]](https://www.crankbaitt.com/wp-content/uploads/2025/8/1756613396/blue-sea-6004200-single-circuit-on-off-w-locking-key-black-6004200-1.webp)
![Blue Sea 3003 HD-Series Battery Switch Selector w/Alternator Field Disconnect [3003]](https://www.crankbaitt.com/wp-content/uploads/2025/8/1756613368/blue-sea-3003-hd-series-battery-switch-selector-w-alternator-field-disconnect-3003.webp)
![Blue Sea 9004e e-Series Battery Switch Single Circuit ON/OFF w/Alternator Field Disconnect [9004E]](https://www.crankbaitt.com/wp-content/uploads/2025/8/1756613362/blue-sea-9004e-e-series-battery-switch-single-circuit-on-off-w-alternator-field-disconnect-9004e.webp)
![Blue Sea 7610 120 Amp SI-Series Automatic Charging Relay [7610]](https://www.crankbaitt.com/wp-content/uploads/2025/8/1756613374/blue-sea-7610-120-amp-si-series-automatic-charging-relay-7610.webp)
Reviews
There are no reviews yet.