Tesla TMCBO420M 4 Pole 20 Amp 6kA Type A RCBO Safety Switch

Description

Twenty amps, four poles. HVAC, commercial kitchen, three-phase appliances.

The Tesla TMCBO420M is a 4 Pole 20A 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 20A it is the standard choice for three-phase HVAC circuits, commercial kitchen equipment, and dedicated three-phase appliance circuits in Australian commercial and hospitality switchboards.

• 4 Pole (3P+N switched neutral) / 20A / 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.

The Go-To RCBO for Three-Phase HVAC and Commercial Kitchen Circuits

The 20A four-pole RCBO is one of the highest-demand ratings in Australian commercial switchboard work. Three-phase split system air conditioners and commercial HVAC plant, combi ovens, commercial dishwashers, refrigeration compressors, and cool room plant are all routinely wired on 20A three-phase circuits — and all require both overcurrent and earth leakage protection under AS/NZS 3000. The TMCBO420M delivers both in a single 72mm device, with each circuit independently protected. A fault on the dishwasher circuit doesn't take out the cool room or the HVAC at the same time.

Type A — Essential for Inverter HVAC and Electronic Kitchen Equipment

Modern three-phase HVAC inverter compressors and electronically controlled commercial kitchen equipment generate pulsating DC fault currents that a Type AC RCBO won't detect. The Type A characteristic of the TMCBO420M detects both sinusoidal and pulsating DC residual currents — the correct specification for any circuit feeding variable-speed drives, inverter compressors, or switch-mode controlled commercial equipment. For commercial kitchen and HVAC applications in Australia today, Type A is the right call.

Termination and Installation

Clips straight onto 35mm DIN rail. Accepts conductors up to 25mm² and is compatible with both comb busbar and individual wiring configurations. At 72mm, four poles of combined RCBO protection occupy the space of a standard 4-pole MCB. IP20 is appropriate for any enclosed switchboard or distribution enclosure.

Q: Is the TMCBO420M the right RCBO for a three-phase split system air conditioner?
A: Yes — 20A is the standard circuit rating for most three-phase split system and ducted air conditioning units in Australian commercial installations. The TMCBO420M provides both the overcurrent protection (replacing the MCB) and the mandatory earth leakage protection (replacing the shared RCD) in a single 4-pole device. Always confirm the unit's rated current draw and cable sizing against AS/NZS 3000 and the manufacturer's installation guide.

Q: Why is Type A earth leakage specified for inverter HVAC equipment?
A: Inverter-driven HVAC compressors use variable-speed drive electronics that generate pulsating DC fault currents in addition to standard sinusoidal AC fault currents. A Type AC RCBO only detects sinusoidal fault currents and may not respond to pulsating DC faults from inverter equipment. Type A detects both — making it the correct and safer specification for any circuit feeding modern inverter HVAC systems.

Q: Is the Tesla TMCBO420M approved for use in Australian switchboards?
A: The TMCBO420M 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.