Schneider Electric Acti9 iC65N DC 1P 25A MCB

Technical Overview

Single-pole 25A DC miniature circuit breaker with a C-curve trip characteristic, 60 VDC rated operational voltage, and 6 kA breaking capacity for DC systems.

Key Features

Tailored for low voltage direct current (DC) electrical distribution applications
Magnetic tripping limit calibrated for C-curve response at 8.5 x In +/- 20%
Visi-Safe technology ensures visible safety indication during downstream maintenance
Visi-Trip diagnostic indicator quickly identifies faulty circuit lines
Fast-closing mechanism reduces contact wear and extends unit operating life
High flame-retardant PA66 housing designed for extreme operating conditions
Easy modular mounting on standard 35 mm symmetrical DIN rails
Compact 18 mm width allows for high-density electrical panel organization

Technical Specification Matrix

Parameter	Value
Number of Poles	1P
Rated Current (In)	25 A at 40 °C
Rated Operational Voltage (Ue)	60 V DC
Tripping Curve	C Curve
Rated Short-Circuit Breaking Capacity (Icu)	6 kA conforming to IEC/EN 60947-2
Rated Insulation Voltage (Ui)	500 V DC
Rated Impulse Withstand Voltage (Uimp)	6 kV conforming to IEC/EN 60947-2
Mechanical Durability	20,000 cycles
Electrical Durability	10,000 cycles
IP Rating	IP20 (IP40 inside enclosure)
Operating Temperature Range	-30 °C to +70 °C
Storage Temperature Range	-40 °C to +70 °C
Tightening Torque	2.5 N.m
Connection Capacity	1 to 25 mm² rigid/flexible (upper), 1 to 16 mm² (lower)
Applicable Standards	GB/T 14028.2, IEC/EN 60947-2
Physical Weight (kg)	0.13
Dimensions L x W x H (cm)	7 x 1.8 x 8.5

Industrial Applications

1. Solar Photovoltaic String Combiner Protection

Solar PV arrays generate direct current that must be safely isolated in string combiner boxes. The A9N18125 is utilized to safeguard individual PV strings operating up to 60 V DC against electrical faults before they reach the central inverter.

Problem Solved

Prevents high DC fault currents from propagating and damaging costly sub-components, enabling safe localized maintenance without shutting down the entire solar generation facility.

Solar PV ProtectionString Combiner Box60 VDC ProtectionC-Curve TrippingDC Overcurrent Isolation

2. Industrial Battery Energy Storage System (BESS) Control Circuit Guarding

Industrial BESS networks utilize low-voltage DC auxiliary rails to drive Battery Management Systems (BMS), controllers, and visual status equipment. The A9N18125 is installed on the 48V/60V DC auxiliary power lines to provide thermal-magnetic overload protection.

Problem Solved

Avoids thermal-runaway consequences and damage to critical control units due to sudden short-circuit incidents on low-voltage battery loops, while fitting onto high-density DIN rails inside battery racks.

BESS Auxiliary ControlBMS ProtectionThermal-Magnetic TripDIN Rail MountingShort-Circuit Mitigation

3. Telecom Base Station DC Power Distribution

Telecommunication infrastructure runs primarily on 48V DC power distribution cabinets. The 25A rated current and 1P form factor of this MCB makes it ideal for securing specific power feeds leading to cellular transceiver and base station antennas.

Problem Solved

Suppresses localized overload occurrences without tripping the entire central distribution board, keeping the remaining communication grid online while allowing easy local Visi-Trip diagnostics.

Telecom Power Distribution48V DC SystemsVisi-Trip DiagnosticsOverload GuardingHigh-density Panels