Hager NT140C Miniature Circuit Breaker MCB 40A 1 Pole C Curve 10kA 1 Module DIN Rail 240-415V

Description

40A protection with 10kA breaking.

The Hager NT140C is a 40A single-pole miniature circuit breaker (MCB) with a C tripping curve and 10kA breaking capacity, protecting circuits against overload and short circuit from a compact 1-module DIN rail body.

Key Features

• Rated current: 40A, single pole (1P)
• C tripping curve (5–10x In)
• 10kA breaking capacity (Icn) to IEC 60898-1
• Rated voltage 240–415V AC, insulation voltage 500V
• Compact 1-module width (17.5mm) DIN rail mount
• Accepts conductors 1–35mm² rigid, 1–25mm² flexible
• Energy limiting class 3; IP20; 360° mounting
• Compliant with AS/NZS 60898.1

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Why it Matters

For sub-mains and heavy circuits.
The NT140C is a 40A miniature circuit breaker, protecting a circuit against both overload and short circuit and tripping automatically when either occurs. A 40A rating suits sub-mains and the heaviest single final circuits – large appliances, sub-boards and high-demand equipment feeds – and its high 10kA breaking capacity handles the fault levels found in commercial and industrial switchboards.

C curve for general-purpose loads.
The C tripping characteristic trips on short circuit at 5 to 10 times rated current, the general-purpose curve suited to mixed resistive and moderately inductive loads. Backed by a 10kA short-circuit breaking capacity to IEC 60898-1 and energy limiting class 3, the NT140C limits let-through energy during a fault to help protect downstream cabling and equipment.

Built for Australian switchboards.
At one module (17.5mm) wide, 83mm high and 70mm deep, the NT140C clips onto standard 35mm DIN rail with 360° mounting flexibility, and its terminals take rigid conductors up to 35mm² at 2.8Nm. It is compliant with AS/NZS 60898.1, rated IP20, and operates from -25°C to 70°C to suit meter boxes, distribution boards and plant rooms across Australian conditions. Hager auxiliaries including the MZ201 auxiliary contact, MZ202 alarm contact and MZ203/MZ204 shunt trips are available.

Q: What is the Hager NT140C used for?
It is a 40A single-pole MCB for protecting sub-mains and heavy single circuits – such as sub-boards and large appliance feeds – against overload and short circuit, with a 10kA rating suited to commercial and industrial boards.

Q: What does the C curve mean on the NT140C?
The C curve trips on short circuit at 5 to 10 times the rated current, making it the general-purpose characteristic for mixed resistive and moderately inductive loads.

Q: What is the difference between the NT140C (10kA) and a 6kA MCB?
10kA is the rated short-circuit breaking capacity, suited to higher-fault commercial and industrial boards; a 6kA breaker such as Hager's MSN range is used where fault levels are lower, typically residential and light commercial.