The FH27LB is a high-performance latching relay engineered for demanding applications, produced by Zhejiang Fanhar Electronics Co. in accordance with ISO9001 and ISO14001 certification standards. This relay is well-suited for application scenarios including smart metres, compound switches, smart homes, and new energy systems.
Significant current handling capability: 100A switching capacity, with a maximum switching current of 120A.
Wide voltage range: supports 277VAC (standard) and 415VAC rated loads
Fast response: Closing and disconnecting time ≤25ms
Excellent insulation performance: 1000MΩ insulation resistance (500VDC), 4000VAC 1-minute dielectric strength between coil and contacts
Long life: Mechanical life up to 100,000 operations, electrical life up to 150,000 operations at 277VAC/100A.
Robust Construction: Impact resistance of up to 980 m/s² (100 g), vibration resistance from 10 Hz to 55 Hz at 1.5 mm DA.
Sustainable materials: RoHS-compliant AgSnO₂ contact material
Coil options: single coil and dual coil versions available
Multiple Voltages: Supports DC5V/6V/9V/12V/24V/48V voltage ratings.
Customised accessories: External accessories can be customised to meet the needs of the user.
The FH27LB latching relay is particularly suitable for:
Remote load control: Used in smart meters to remotely energize and de-energize high-current loads (100A@277VAC), supporting automatic meter reading and electricity consumption management.
Anti-theft protection: promptly disconnects abnormal electrical circuits (response time ≤25ms) to ensure metering precision.
Prepaid metres: ideal for situations requiring frequent management, these metres offer high-frequency switching operation with a mechanical life of one million times.
Capacitor Throw Switch: Suitable for 415VAC/100A capacitive load switching, this switch ensures long life and quick reaction (≤25ms) in reactive power compensation systems.
Dual power switching (ATS): Seamless switching of main and backup circuits in backup power systems to meet high reliability requirements.
Motor Control: Suitable for AC contactor auxiliary control, providing stable switching performance.
High-power appliance control: such as central air-conditioning, electric water heaters, smart sockets, etc. It supports remote or automated control of 100A loads.
Home Energy Management (HEMS): integrated in smart distribution box to achieve power distribution and energy saving optimization.
Security system: used for power control of access control and alarm system to ensure high reliability.
Photovoltaic inverter: used for circuit switching on the direct current (DC) or alternating current (AC) side, supporting high voltage (440VAC) and high current (120A) environments.
Energy Storage Systems (ESS): for fast, reliable circuit turn-on and turn-off in battery charge/discharge management systems.
Microgrid control: to provide steady system functioning for off-grid/grid-connected switching.
All FH27LB relays are rigorously tested to meet IEC62055-31 test requirements to ensure reliable performance under various load conditions. The products are designed with anti-solder flux to provide a stable long-term usage experience.
