GCB-100 Manual Reset Circuit Breaker 100 Amp DC

Description

GCB-100. Manual Reset. 100 Amp. 42V DC Maximum. Type 3 Thermal Circuit Breaker. Surface Mount. Sold Individually.

The GCB-100 is a 100 Amp Type 3 manual reset circuit breaker rated to 42V DC maximum (30V DC UL approved) — suited to 12V and 24V DC automotive, marine, caravan, and high-current DC installations. Type 3 manual reset: when a fault trips the breaker, it stays open until the reset button is manually pressed — requiring deliberate operator action to restore power after a fault, rather than automatically retrying. Stud terminal connections. Surface mount bracket. Sold individually.

• GCB-100 — 100 Amp Manual Reset Circuit Breaker DC
• Current rating: 100 Amp
• Voltage rating: 42V DC maximum (30V DC UL approved) — suits 12V and 24V DC systems
• Type 3 manual reset — stays tripped until reset button is manually pressed
• Thermal trip mechanism — trips on overcurrent or short circuit
• Stud terminal connections — suits ring terminals and cable lugs
• Surface mount bracket — panel or chassis mount
• Thermoset plastic housing
• Suits: automotive, marine, caravan, RV, 4WD, solar, dual battery, winch, main battery feed circuits
• Sold individually

Order online — fast dispatch Australia-wide.

About the GCB-100 — Manual Reset vs Auto Reset Circuit Breakers

A circuit breaker provides resettable overcurrent protection — unlike a fuse which must be replaced after it blows, a circuit breaker can be reset and returned to service after the overcurrent condition is cleared. The GCB-100 is a Type 3 manual reset breaker — after tripping on an overcurrent condition, the breaker stays open and power remains off until the reset button on the breaker body is deliberately pressed. This requires the operator to physically attend the breaker, investigate the cause of the trip, and make a conscious decision to restore power.

Manual reset (Type 3) is the preferred choice for high-current circuits where automatic power restoration after a fault could cause damage or a safety hazard — main battery feeds, inverter inputs, solar charge controller outputs, high-current winch circuits, and other heavy DC loads where a repeated auto-reset cycle could cause overheating or fire. At 100 Amp, the GCB-100 is suited to the heaviest circuits in Australian automotive, marine, and caravan installations — main battery to auxiliary battery feeds, large inverter protection, high-current solar charge controller outputs, and heavy winch and compressor circuits where a resettable 100A protection device is required.

Q: What is the difference between Type 1, Type 2, and Type 3 circuit breakers?
A: Type 1 (auto reset) automatically resets and retries after tripping. Type 2 (modified reset) trips and stays open until power is cycled off and on. Type 3 (manual reset) trips and stays open until the reset button is manually pressed — the GCB-100 is Type 3. Select the type appropriate for the circuit application.

Q: What is the difference between GCB-70 and GCB-100?
A: Both are Type 3 manual reset surface mount circuit breakers with the same voltage rating and terminal style. The GCB-70 is rated at 70 Amp; the GCB-100 is rated at 100 Amp. Select the rating that matches the maximum continuous current of the circuit being protected.

Q: Why use a manual reset breaker instead of a fuse at 100A?
A: A manual reset breaker can be reset without replacing any component — after identifying and correcting the fault, the breaker is reset with a button press and the circuit is restored. A 100A fuse must be physically replaced after it blows, requiring a spare fuse to be on hand. In remote or off-road applications, a resettable breaker provides faster fault recovery.

Q: Is the GCB-100 sold individually?
A: Yes — the GCB-100 is sold individually.