Circuit Breakers

When supplying a branch circuit with more than one live conductor, each live conductor must be protected by a breaker pole. To ensure that all live conductors are interrupted when any pole trips, a “common trip” breaker must be used. These may either contain two or three tripping mechanisms within one case, or for small breakers, may externally tie the poles together via their operating handles. Two-pole common trip breakers are common on 120/240-volt systems where 240 volt loads (including major appliances or further distribution boards) span the two live wires. Three-pole common trip breakers are typically used to supply three-phase electric power to large motors or further distribution boards.

Two- and four-pole breakers are used when there is a need to disconnect multiple phase AC, or to disconnect the neutral wire to ensure that no current flows through the neutral wire from other loads connected to the same network when workers may touch the wires during maintenance. Separate circuit breakers must never be used for live and neutral, because if the neutral is disconnected while the live conductor stays connected, a dangerous condition arises: the circuit appears de-energized (appliances don’t work), but wires remain live and some RCDs may not trip if someone touches the live wire (because some RCDs need power to trip). This is why only common trip breakers must be used when neutral wire switching is needed.

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  • Blue Sea A-Series Black Magnetic Circuit Breaker 5A – 50A

    $14.99
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  • Blue Sea A-Series Black Magnetic Circuit Breaker – World Double Pole

    $33.55
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  • Blue Sea A-Series Red Magnetic Circuit Breaker – World Single Pole

    $14.99
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  • Blue Sea A-Series White Magnetic Circuit Breaker – World Double Pole

    $32.55
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  • Blue Sea C-Series White Magnetic Circuit Breaker – World Double Pole

    $75.99
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  • Dual USB Charger Socket Outlet Panel Mount (2 units)

    Sale! $39.99 $15.99
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  • Dual USB Charger Socket Outlet 3.1 Amp Panel Mount

    Sale! $15.99 $9.99
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  • Blue Sea 15 Amp White Circuit Breaker Ten Pack

    Sale! $150.00 $119.00
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  • Medium Duty Push Button Reset Only Circuit Breaker

    $34.99
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  • Blue Sea A-Series Circuit Breaker Toggle Guard

    $5.00
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  • Blue Sea A-Series White Magnetic Circuit Breaker 5A – 50A

    $13.99
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Showing all 11 results