Clipsal MX9MC140 MAX9 Miniature Circuit-Breaker MCB 1P 40A C Curve 6kA 240/415V

Description

Single-pole 40A protection built for tough Aussie switchboards.

The Clipsal MX9MC140 is a 1-pole 40A miniature circuit-breaker from the MAX9 range, delivering a C-curve trip characteristic and 6kA breaking capacity for reliable overload and short-circuit protection on final sub-circuits. Rated 240/415V and built to AS/NZS 60898, it's a dependable distribution-board workhorse for electricians fitting out homes, commercial fit-outs and light industrial boards.

Key Features

• Rated current 40A at 30°C, single pole (1P)
• C-curve tripping (5–10 x In) — suits general mixed lighting and power circuits
• Breaking capacity 6000A (Icn) to AS/NZS 60898
• Rated 240/415V AC, 50/60Hz
• Compatible with MAX9 18mm-pitch pin busbar for fast connection
• Line connection from top or bottom for install flexibility
• Through-hole for sealing by wire (40A and above) plus padlockable in the OFF position
• Positive contact indicator on the toggle
• Endurance rated to 20,000 mechanical and 10,000 electrical cycles
• Single module wide (18mm) — 2 x 9mm pitches
• Backed by a 7-year Clipsal warranty

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Why it Matters

C-Curve for General Circuits
The C-curve trips between 5 and 10 times rated current, giving it the headroom to ride out normal inrush from mixed lighting and small-motor loads without nuisance tripping, while still clearing genuine faults quickly. It's the go-to characteristic for general-purpose final sub-circuits in Australian distribution boards.

Wire Sealing for Secured Circuits
At 40A and above, this MCB includes a through-hole for sealing by wire, letting you lock the device against unauthorised removal — useful where a circuit needs to stay verifiably in place. It's also compatible with the A9A26970 padlocking device for OFF-position locking.

Backup Protection for MAX9 Surge Devices
Clipsal specifies the 1P 40A MX9MC140 as the recommended backup protection device for the 1P MAX9 surge protection device (MX9SP140), making it a natural pairing when building surge protection into a MAX9 board.

Is the MX9MC140 a single-pole breaker?
Yes. It is a 1-pole (1P) MCB occupying a single 18mm module on the DIN rail, protecting one active conductor.

What does the C curve mean on this MCB?
C-curve means the breaker trips magnetically at 5 to 10 times its 40A rating, making it suitable for general circuits with moderate inrush such as lighting and power outlets.

Can the MX9MC140 be used with a MAX9 surge protector?
Yes. Clipsal recommends the 1P 40A MX9MC140 as the backup protection device for the 1P MAX9 SPD (MX9SP140).