Clipsal MX9MC240 MAX9 MCB 2P 40A C Curve 6kA 415V Miniature Circuit Breaker

Description

Double-pole 40A protection for sub-mains and heavy final sub-circuits.

The Clipsal MX9MC240 is a 2-pole, 40A Type C miniature circuit breaker from the MAX9 range, delivering 6kA short-circuit breaking capacity at 415V for distribution boards across Australian residential, commercial and light-industrial installations.

Key Features

• Rated current: 40A at 30°C
• Poles: 2P (2 protected poles)
• Trip curve: Type C (magnetic tripping 5–10 x In)
• Breaking capacity: 6000A (6kA) Icn at 415V AC, conforming to AS/NZS 60898
• Rated voltage: 415V AC 50/60Hz
• Module width: 2 modules (36mm)
• Terminals: Tunnel-type, top or bottom entry, up to 35mm² rigid
• Top and bottom line connection for installation flexibility
• Through-hole for sealing by wire (40A and above)
• Contact position indicator and ON/OFF toggle signalling
• Padlockable in the OFF position
• 7-year warranty

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Why it Matters

Built for Australian conditions

The MX9MC240 is designed to operate across a wide ambient range of −25°C to +70°C (with derating), making it suitable for switchboards in hot roof spaces, sheds and exposed plant rooms. It carries the RCM mark and is built to AS/NZS 60898, so it meets the compliance expectations of licensed electricians working to the Wiring Rules.

Handles sub-mains and heavier loads

At 40A the MX9MC240 is well matched to sub-mains feeds, larger power circuits and boards protecting workshop equipment or multiple downstream RCBOs. Tunnel-type terminals accept up to 35mm² rigid conductors with a 3.5 N.m tightening torque for a solid, gas-tight connection.

Extra tamper resistance

From 40A upwards, MAX9 MCBs include a through-hole for sealing by wire — useful where switchboard access needs to be verifiable, such as landlord or asset-management boards. The device is also compatible with the A9A26970 padlocking accessory.

Fast, flexible installation

Line connection can be taken from either the top or bottom, and the breaker is compatible with the MAX9 18mm pitch pin-type busbar system. A double locking clip speeds mounting and removal on the DIN rail. Endurance is rated at 20,000 mechanical and 10,000 electrical cycles.

Is the MX9MC240 a single or double pole breaker?
It is a 2-pole (double pole) MCB, switching and protecting two poles simultaneously.

What size cable can I use with the MX9MC240?
The tunnel terminals accept up to 25mm² flexible or 35mm² rigid conductors, from top or bottom, at 3.5 N.m tightening torque.

What is the breaking capacity of the MX9MC240?
It has a 6000A (6kA) short-circuit breaking capacity at 415V AC, conforming to AS/NZS 60898.