Clipsal MAX9 Miniature Circuit-Breaker (MCB) 3-Pole 50A C-Curve 6kA 415V Distribution

Description

Three-pole 50A distribution protection built for tough Aussie switchboards.

The Clipsal MX9MC350 is a 3-pole 50A 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 three-phase final sub-circuits. Rated 415V AC 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 50A at 30°C, three pole (3P)
• C-curve tripping (5–10 x In) — suits general mixed lighting and power circuits
• Breaking capacity 6000A (Icn) to AS/NZS 60898
• Rated 415V AC, 50/60Hz
• Compatible with MAX9 18mm-pitch pin busbar for fast connection
• MAXBAR compatible when used as main incomer
• Line connection from top or bottom for install flexibility
• Tunnel-type terminals — 1–25 mm² flexible or 1–35 mm² rigid
• Through-hole for sealing by wire (40A and above) plus padlockable in the OFF position
• Endurance rated to 20,000 mechanical and 10,000 electrical cycles
• Three modules wide (54mm) — 6 x 9mm pitches
• Backed by a 7-year Clipsal warranty

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Why it Matters

C-Curve for General Three-Phase Circuits
The C-curve trips between 5 and 10 times rated current, giving it the headroom to ride out normal inrush from motors, transformers, lighting banks and mixed loads without nuisance tripping, while still clearing genuine faults quickly. It's the go-to characteristic for general-purpose three-phase 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.

Built Tough and Built to Last
Rated to 20,000 mechanical and 10,000 electrical operations, with an operating range of -25°C to 70°C (derating applies), the MX9MC350 is made for the temperature swings of real Australian switchboards. Limitation class 3 keeps let-through energy down during a fault, protecting downstream cabling.

Is the MX9MC350 a three-pole breaker?
Yes. It is a 3-pole (3P) MCB occupying three 18mm modules (54mm total) on the DIN rail, protecting all three active conductors of a three-phase circuit with a common trip bar.

What does the C curve mean on this MCB?
C-curve means the breaker trips magnetically at 5 to 10 times its 50A rating, making it suitable for general three-phase circuits with moderate inrush such as motors, lighting banks and mixed power outlets.

What is the breaking capacity of the MX9MC350?
It has a rated short-circuit breaking capacity of 6000A (6kA) Icn at 415V AC, tested to AS/NZS 60898 for use in residential and commercial switchboards.