Tesla TMCBO425M 4 Pole 25 Amp 6kA Type A RCBO Safety Switch

Description

Twenty-five amps, four poles. Large HVAC, industrial machinery, sub-main feeds.

The Tesla TMCBO425M is a 4 Pole 25A 6kA 30mA Type A RCBO built to AS/NZS 61009.1. 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. At 25A it sits at the crossover between commercial and industrial applications — suited to large rooftop HVAC units, industrial machinery requiring RCD compliance, and three-phase sub-main feeds where combined protection is needed in one device.

• 4 Pole (3P+N switched neutral) / 25A / 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
• Range: available 10A, 16A, 20A, 25A, 32A, 40A

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

Commercial-Industrial Crossover — Two Roles, One Rating

The 25A four-pole RCBO covers load territory that the 20A can't reach. Large rooftop HVAC units, chillers, and commercial air handling systems with three-phase supply often draw more than 20A — pushing the circuit into 25A territory. At the same time, industrial applications requiring RCD compliance on three-phase machinery circuits — conveyor systems, packaging lines, food processing equipment — routinely land at 25A. The TMCBO425M handles both with Type A earth leakage and C Curve overcurrent protection in a single 72mm device.

As a sub-main RCBO, the 25A also serves as a combined overcurrent and earth leakage protection device on sub-main feeds to downstream distribution boards where both functions are required on the one circuit — consolidating two separate devices into one.

Type A — Covering VSD and Industrial Electronic Loads

Large variable speed drive (VSD) systems, inverter-driven industrial machinery, and electronically controlled process equipment generate pulsating DC fault currents that a Type AC RCBO won't detect. The TMCBO425M's Type A characteristic detects both sinusoidal and pulsating DC residual currents — the correct specification for any three-phase industrial circuit feeding modern electronic drives and equipment.

Q: When should I use a 25A 4-pole RCBO instead of a 20A?
A: Choose 25A when the calculated three-phase circuit load or cable sizing exceeds 20A — typically for large rooftop HVAC units, chillers, higher-draw industrial machinery, or sub-main feeds where 20A is insufficient. Always confirm circuit sizing against the equipment's rated input current and AS/NZS 3000 requirements.

Q: Is the TMCBO425M suitable for circuits feeding variable speed drives?
A: Yes — the Type A residual current characteristic detects both sinusoidal AC and pulsating DC fault currents generated by VSD electronics. This makes it the correct specification for three-phase circuits feeding variable speed drives and other industrial electronic equipment, where a Type AC RCBO may fail to detect DC-component fault currents.

Q: Is the Tesla TMCBO425M approved for use in Australian switchboards?
A: The TMCBO425M 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 sites.