Hager NT120C Miniature Circuit Breaker MCB 20A 1 Pole C Curve 10kA 1 Module DIN Rail 240-415V

Description

20A protection with 10kA breaking.

The Hager NT120C is a 20A 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: 20A, 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 heavier power sub-circuits.
The NT120C is a 20A miniature circuit breaker, protecting a circuit against both overload and short circuit and tripping automatically when either occurs. A 20A rating steps above the common 16A size for larger power sub-circuits and dedicated higher-draw appliance 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 NT120C 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 NT120C 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 NT120C used for?
It is a 20A single-pole MCB for protecting larger power sub-circuits and higher-draw 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 NT120C?
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 NT120C (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.