Tesla TMCBO440M 4 Pole 40 Amp 6kA Type A RCBO Safety Switch

Description

Forty amps, four poles. The highest-rated 4P RCBO in the Tesla range.

The Tesla TMCBO440M is a 4 Pole 40A 6kA 30mA Type A RCBO built to AS/NZS 61009.1 — the highest-rated 4-pole RCBO in the Tesla range. It combines residual current (earth leakage) and overcurrent (circuit breaker) protection across all four conductors — 3P+N switched neutral — in a single 72mm DIN rail device. Specified as the main incomer RCBO on large three-phase distribution boards, for direct combined protection of the largest three-phase industrial plant, and on major Australian mining and infrastructure installations where no lower RCBO rating is sufficient.

• 4 Pole (3P+N switched neutral) / 40A / 6kA breaking capacity
• 30mA residual current trip — personal protection threshold
• Type A — detects sinusoidal and pulsating DC residual currents
• C Curve overcurrent trip — general-purpose, handles moderate inrush
• 415V AC three-phase / 50-60Hz
• DIN rail mount — 72mm footprint, 35mm rail
• Conductor up to 25mm² — compatible with comb and busbar systems
• IP20 rated for enclosed switchboard installation
• AS/NZS 61009.1
• Mechanical life: 10,000 cycles | Electrical life: 4,000 cycles
• TMCBO range highest rating — 10A to 40A

Fast shipping across Australia — order online now for quick dispatch.

Maximum Capacity. Mandatory Compliance. One Device.

At 40A, the TMCBO440M is the ceiling of the Tesla 4-pole RCBO range — specified when no lower rating is sufficient and both overcurrent and earth leakage protection must be combined in a single 4-pole device. As a main incomer RCBO, it protects large three-phase distribution boards at the incoming supply point where mandatory combined RCD and MCB protection is required. As a direct equipment RCBO, it handles the largest three-phase industrial plant, heavy compressors, and high-draw process machinery where RCD compliance is required alongside overcurrent protection.

The 3P+N switched neutral configuration ensures complete isolation of all four conductors including neutral on trip — a non-negotiable requirement on regulated Australian mining and heavy industrial installations. Despite the 40A rating, the HPC2 construction keeps the footprint at 72mm — the same compact size as every other device in the TMCBO range.

Type A — No Compromise on Large Electronic Loads

Large VSDs, heavy mining machinery with electronic controls, and major industrial plant generate pulsating DC fault currents that a Type AC RCBO won't detect. The TMCBO440M's Type A characteristic detects both sinusoidal and pulsating DC residual currents — the correct and complete specification for any large three-phase circuit feeding modern electronic drive systems on Australian mine sites and heavy industrial installations. For applications beyond 40A requiring combined protection, consult your Tesla wholesaler for MCCB-based RCD solutions.

Q: Is 40A the highest 4-pole RCBO available in the Tesla range?
A: Yes — 40A is the highest rating in the Tesla TMCBO 4-pole 6kA Type A RCBO range. For three-phase circuits requiring combined overcurrent and earth leakage protection above 40A, a Moulded Case Circuit Breaker (MCCB) with integrated or external RCD module would typically be specified instead.

Q: Is the TMCBO440M suitable for use as a main incomer RCBO on an industrial distribution board?
A: Yes — at 40A it is commonly specified as the main incomer combined RCD/MCB on large three-phase distribution boards in industrial and mining installations where combined earth leakage and overcurrent protection is required at the incomer. Always confirm incomer sizing against the board's maximum demand, cable ratings, and upstream protection in accordance with AS/NZS 3000.

Q: Is the Tesla TMCBO440M approved for use in Australian switchboards?
A: The TMCBO440M is built to AS/NZS 61009.1 and is suitable for use in compliant Australian commercial and industrial switchboard installations. Confirm the applicable approval number with Tesla Electrical Components or your wholesaler prior to specification on regulated mine sites and major industrial facilities.