Name: Schneider Easy9 MGNEA9A45D25 Miniature Circuit Breaker - INOSAKI
SKU: Schneider-MGNEA9A45D25
Price: 19.40 USD
Availability: InStock

Technical Overview

25A 1P+N miniature circuit breaker with D trip curve and 4.5 kA breaking capacity at 230VAC. DIN rail mount, 18mm width, designed for high inductive loads.

Key Features

Compact 1P+N configuration designed to protect phase and disconnect neutral in a single 18mm modular width.
D-curve tripping characteristic designed for circuits with high transient inrush currents.
High mechanical and electrical durability rated up to 20,000 cycles for extended service life.
Clear local status signaling on/off indication on the front face for safe maintenance operations.
User-friendly DIN rail mounting with secure dual-position locking clips.
Conforms to rigorous global standards including GB 10963.1 and IEC 60898-1 with CCC certification.

Technical Specification Matrix

Parameter	Value
Poles Description	1P + N
Rated Current (In)	25 A at 30 °C
Curve Code	D
Rated Operational Voltage (Ue)	230 V AC 50 Hz
Breaking Capacity	4.5 kA Icn conforming to IEC 60898-1 / GB 10963.1
Service Breaking Capacity (Ics)	4.5 kA conforming to IEC 60898-1 / GB 10963.1
Network Type	AC
Network Frequency	50 Hz
Control Type	Toggle (Handle)
Mechanical Durability	20000 cycles
Electrical Durability	20000 cycles
Tightening Torque	2.5 N.m
Terminal Type	Tunnel terminal blocks (upper or lower wiring) <= 16 mm²
Operating Temperature	-25...60 °C
Storage Temperature	-40...80 °C
Physical Weight (kg)	0.11
Dimensions L x W x H (cm)	7.55 x 1.76 x 7.7

Industrial Applications

1. Air Conditioning & Heat Pump Compressors Protection

Protecting single-phase 230VAC heating, ventilation, and air conditioning (HVAC) compressors that require a D-curve trip profile to handle high startup inrush currents without nuisance tripping.

Problem Solved

Standard C-curve breakers trip prematurely during compressor startup due to momentary high-current surges. The D-curve profile (typically 10-14x In magnetic trip) permits the initial surge while safely guarding against prolonged thermal overload.

D Curve230VAC Single-PhaseHVAC ProtectionHigh Inrush CurrentCompressor Startup

2. Fractional Horsepower Motor & Pump Control

Protecting fractional horsepower single-phase water pumps, fans, and conveyor motors in light commercial or utility systems where inductive surges are frequent.

Problem Solved

Solves the issue of branch circuit breaker fatigue and false trips caused by inductive motor startup currents. The 25A rating combined with D-curve characteristics allows reliable motor starting while ensuring robust 4.5kA short-circuit protection.

Inductive Load ProtectionSingle-Phase MotorWater PumpsThermal-Magnetic TripEasy9 DPN

3. Control Transformer Primary Protection

Safely isolating and protecting the primary winding of 230V control power transformers or high-capacity LED driver arrays within industrial control panels.

Problem Solved

Transformer energization creates massive momentary magnetizing inrush currents (often exceeding 10x rated current). A standard breaker would immediately trip, whereas the MGNEA9A45D25 absorbs this transient spike while preserving phase-and-neutral isolation in a compact 18mm form factor.

Transformer ProtectionInrush MagnetizationControl Panel Distribution1P+N IsolationDIN Rail MCB