48V DC 600A Continuous 2500A Starting Marine Battery Isolator Switch Battery Disconnect Switch

At this current level the isolator stops being an accessory and becomes part of the power architecture. The MT055 carries 600 amps continuously, 800 amps intermittently, and 2500 amps during engine or motor starting, on systems up to 48 volts. It is intended for electric-drive craft, large lithium banks, thruster and windlass installations, and commercial vehicles where a small switch would simply be the weakest link.

Operation remains two positions, ON and OFF, with a hard stop at each. Simplicity matters here: a large switch that cannot be misread is safer than a selector with extra detents, particularly when the person isolating the system is not the person who installed it.

Everything about the installation is heavier too. Cable lugs are bigger, torque values are higher, and the surface it mounts to must carry real weight. The notes below focus on those details, because at 48 volts and several hundred amps, the termination is the part that fails first.

Each figure has a purpose and none of them substitutes for another. Running an 800A intermittent load continuously will cook the contacts; treating 2500A as a working rating will do the same. Size the installation against the continuous number and use the other two as short-duration allowances.

• Arc energy — never operate the switch under load; shut the drive or engine down first.
• Insulated tools — use rated tools and remove metal jewellery during installation.
• Two-person rule — have a second person present when working on a live-capable 48V bank.
• Lockout — leave the dial at OFF and note it in the service log before any work downstream.
• PPE — face and hand protection when torqueing large studs on a high-current bank.

• Large-frame contact set — dimensioned for the continuous, intermittent and starting figures above.
• Copper current path — minimises resistance and stud heating under sustained load.
• Reinforced mounting base — resists distortion when heavy studs are torqued down.
• Oversized terminal studs — accept large ring lugs without reducing cable cross-section.
• Detented ON and OFF — the dial cannot creep out of position under vibration.
• Clear face legend — state visible at arm's length and identifiable by touch.

1. Isolate the bank, remove the negative lead first, and verify dead at both studs.
2. Select cable cross-section against 600A continuous, not the starting figure.
3. Mount on a flat rigid surface able to carry the weight of large cable without flexing.
4. Bank positive to one stud, drive controller or distribution feed to the other.
5. Use closed ring lugs only, crimped with the correct die, then torque both nuts fully.
6. Cycle the dial once without load, reconnect, and check stud temperature after the first loaded run.

• Minimum order — 5 pcs.
• Price — negotiable, quoted against quantity and packing requirements.
• Capacity — 50,000 pcs per month.
• Lead time — 30 days for standard production.
• Payment — T/T or Western Union; 30% deposit with the balance before shipment.
• Packing — neutral white box inside a brown carton; branded packing available with written trademark authorisation.