Hager MSN120 Miniature Circuit Breaker MCB 20A 1 Pole C Curve 6kA 1 Module DIN Rail 240-415V

Description

20A power-circuit protection.

The Hager MSN120 is a 20A single-pole miniature circuit breaker (MCB) with a C tripping curve and 6kA breaking capacity, protecting residential and light commercial power 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)
• 6kA 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 larger power sub-circuits.
The MSN120 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 higher-draw appliance feeds, and its 6kA breaking capacity suits the fault levels found in residential and light commercial 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 such as power and lighting circuits. Backed by a 6kA short-circuit breaking capacity to IEC 60898-1 and energy limiting class 3, the MSN120 limits let-through energy during a fault to help protect downstream cabling.

Built for Australian switchboards.
At one module (17.5mm) wide, 83mm high and 70mm deep, the MSN120 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 homes 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 MSN120 used for?
It is a 20A single-pole MCB, a common size for protecting larger power sub-circuits and higher-draw appliance feeds against overload and short circuit in residential and light commercial boards.

Q: What does the C curve mean on the MSN120?
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 MSN120 (6kA) and a 10kA MCB?
6kA is the rated short-circuit breaking capacity, suited to residential and light commercial boards; a 10kA breaker such as Hager's NT range is specified where fault levels are higher, typically in commercial and industrial installations.