Hager NT340C Miniature Circuit Breaker MCB 40A 3 Pole C Curve 10kA 3 Module DIN Rail 415V

Description

Three-phase 40A protection, 10kA breaking.

The Hager NT340C is a 40A three-pole miniature circuit breaker (MCB) with a C tripping curve and 10kA breaking capacity, protecting three-phase circuits against overload and short circuit from a compact 3-module DIN rail body.

Key Features

• Rated current: 40A, three-phase (3P)
• C tripping curve (5–10x In)
• 10kA breaking capacity (Icn) to IEC 60898-1
• Rated voltage 415V AC, insulation voltage 500V
• 3-module width (52.5mm) 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

Protects all three phases together.
The NT340C is a 40A three-pole miniature circuit breaker, protecting a three-phase circuit against both overload and short circuit and tripping automatically when either occurs. Its three linked poles switch and protect all three phases as one, suited to heavy three-phase sub-mains and distribution feeds – larger motors, plant and machinery – with a high 10kA breaking capacity for the fault levels found in commercial and industrial switchboards.

C curve for motor and mixed 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 inductive loads including the inrush of three-phase motors. Backed by a 10kA short-circuit breaking capacity to IEC 60898-1 and energy limiting class 3, the NT340C limits let-through energy during a fault to help protect downstream cabling and equipment.

Built for Australian switchboards.
At three modules (52.5mm) wide, 83mm high and 70mm deep, the NT340C 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 distribution boards and plant rooms across Australian conditions. With 18.7W dissipation per pole at full load, allow for heat in tightly packed boards. Hager auxiliaries including the MZ201 auxiliary contact, MZ202 alarm contact and MZ203/MZ204 shunt trips are available.

Q: Is the Hager NT340C a three-phase breaker?
Yes. It is a 3-pole (3P) MCB that switches and protects all three phases of a 415V circuit together; it does not include a separate neutral pole.

Q: What does the C curve mean on the NT340C?
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 inductive loads including motors.

Q: What is the difference between the NT340C (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.