Hager MSN140 Miniature Circuit Breaker MCB 40A 1 Pole C Curve 6kA 1 Module DIN Rail 240-415V

SKU: hagmcb1406k

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Hager MSN140 40A single-pole miniature circuit breaker (MCB) with C tripping curve and 6kA breaking capacity. Compact 1-module DIN rail design protects circuits against overload and short circuit. AS/NZS 60898 compliant.

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40A protection for sub-mains.

The Hager MSN140 is a 40A single-pole miniature circuit breaker (MCB) with a C tripping curve and 6kA breaking capacity, protecting residential and light commercial 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)
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 heavier household circuits.
The MSN140 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 – sub-boards, large appliances and high-demand feeds – and its 6kA breaking capacity suits the fault levels found in residential and light commercial switchboards.

C curve for motor and general 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 motor and general-purpose circuits. Backed by a 6kA short-circuit breaking capacity to IEC 60898-1 and energy limiting class 3, the MSN140 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 MSN140 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 MSN140 used for?
It is a 40A single-pole MCB, a common size for protecting sub-mains and heavy single circuits – such as sub-boards and large appliance feeds – against overload and short circuit in residential and light commercial boards.

Q: What does the C curve mean on the MSN140?
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 MSN140 (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.

(hagmcb1406k)

Electric current
Rated current	40 A
Rated short-circuit breaking capacity Icn under 230 V AC according to IEC 60898-1	6 kA
Rated current -15DegC	51,25 A
Rated current -10DegC	50,19 A
Rated current -5DegC	49,18 A
Rated current at 0DegC	48,14 A
Rated current 5DegC	47,10 A
Rated current 10DegC	46,07 A
Rated current 15DegC	45,03 A
Rated current at 20DegC	43,99 A
Rated current 25DegC	42,95 A
Rated current 30DegC	41,92 A
Rated current 35DegC	40,88 A
Rated current at 40DegC	40 A
Rated current at 45DegC	38,80 A
Rated current at 50DegC	37,63 A
Rated current 55DegC	36,73 A
Rated current 60DegC	35,69 A
Rated current 65DegC	34,65 A
Rated current 70DegC	33,62 A
Architecture
Type of pole	1P
Curve	C
Capacity
Number of modules	1
Installation, mounting
Nominal tightening torque top terminal	2,80 - 2,80 Nm
Nominal tightening torque down terminal	2,80 - 2,80 Nm
Nominal tightening torque	2,80 - 2,80 Nm
Type of bottom connection for modular devices	biconnect
Type of top connection for modular devices	Screw terminal
360?ø mounting position possible	Yes
Main electrical attributes
Rated short-circuit breaking capacity Icn AC according to IEC 60898-1	6 kA
Voltage
Rated operational voltage Ue	240 - 415 V
Type voltage supply	AC
Rated insulation voltage Ui	500 V
Rated impulse withstand voltage Uimp	4000 V
Frequency
Frequency	50 - 60 Hz
Connection
Cross-section of input and output with screws, for massive conductors	1 - 35 mm^2
Cross-section of input and output with screws, for flexible conductors	1 - 25 mm^2
Cross-section of input with screws, for flexible conductors	1 - 25 mm^2
Cross-section of input with screws, for massive conductors	1 - 35 mm^2
Cross-section flexible conductor	1 - 25 mm^2
Cross-section rigid conductor	1 - 35 mm^2
Safety
Ingress Protection (IP) class	IP20
Use conditions
Degree of pollution according to IEC 60664 / IEC 60947-2	2
Class of energy limitation I^2t	3
Air humidity protection	For all climates
Operating temperature	-25 - 70 DegC
Power
Total power loss under IN	4,8 W
Connectivity
Type of connection	Screw terminal
Top connection alignment for modular devices	Aligned terminal
Down connection alignment for modular devices	Aligned terminal
Dimensions
Height	83 mm
Width	17,50 mm
Depth	70 mm