ABB FM9925A-E | F Series Control Relay, 4NO Contacts

Description

FM9925A-E: Product OverviewThe FM9925A-E is a general-purpose control relay belonging to ABB’s F Series of contactor-type relays. In an industrial control system, this device functions as an intermediary between a low-power control source, such as a programmable logic controller (PLC) output card or a timer, and the final load it needs to operate, like a contactor coil, a small motor, a solenoid valve, or an indicator light. Its primary role is to provide electrical isolation and amplify the control signal, allowing a low-current signal to safely switch a higher-current load, thereby protecting sensitive electronic control components from the electrical noise and potential fault currents present in the load circuit.Functionally, the relay operates by energizing its coil with the control voltage. This causes the armature to move, mechanically closing the normally open (NO) power contacts to complete the load circuit. The FM9925A-E is characterized by its four isolated normally open contacts. As part of the modular F Series platform, it offers compatibility with a wide range of accessories, including auxiliary contact blocks (for adding normally closed or additional normally open contacts), mechanical interlocks, and timing modules, providing significant flexibility for circuit design without requiring a completely different relay model.FM9925A-E: Technical Specifications

ABB FM9925A-E

• •Model Number:​ FM9925A-E
• •Manufacturer:​ ABB
• •Product Type:​ Control Relay
• •Contact Configuration:​ 4 Normally Open (4NO)
• •Rated Operational Current (Ie):​ 6 A at 240 VAC / 24 VDC (Resistive Load, AC-15/DC-13)
• •Rated Insulation Voltage (Ui):​ 690 V
• •Rated Thermal Current (Ith):​ 10 A
• •Mechanical Life:​ 10,000,000 operations
• •Electrical Life:​ 1,000,000 operations (at rated resistive load)
• •Coil Voltage:​ Available in a range of standard AC and DC voltages (e.g., 24VAC/DC, 110VAC, 230VAC) – specific voltage is denoted by a suffix.
• •Mounting:​ Standard 35 mm DIN rail
• •Termination:​ Screw clamp terminals
• •Standards:​ IEC/EN 60947-4-1, UL 508
  

  ABB FM9925A-E

Core Features & Customer ValueThe four-pole, normally-open configuration provides significant design flexibility. Engineers can use a single relay to control multiple independent loads simultaneously or parallel the contacts to increase the current rating for a single load. This versatility reduces the number of different component types needed in a panel, simplifying inventory management and allowing for more compact control cabinet layouts.The modular accessory system is a key benefit. The ability to add up to four auxiliary contact blocks (e.g., the ABB EA12-.. series) directly onto the side of the relay allows for customizing the contact configuration to exact application needs. This means a circuit requiring both NO and NC contacts for interlocking and signaling can be built using a single, standard relay base unit, eliminating the need for separate, additional relays and saving space, wiring time, and cost.The high mechanical and electrical lifespan ensures long-term reliability in demanding applications with frequent switching cycles, such as in packaging machinery or automated assembly lines. For maintenance personnel, the transparent dust cover provides visual access to the mechanical operation indicator, allowing for quick status checks and aiding in troubleshooting without the need for electrical measurements.Typical ApplicationsA common application is in machine automation for controlling contactors that drive three-phase motors. A PLC’s transistor output, typically limited to 0.5A, is connected to the coil of the FM9925A-E. The relay’s contacts, rated for a higher current, are then used to energize the coil of a larger contactor, which in turn switches the motor power. This provides essential isolation between the sensitive PLC and the noisy power circuit.In material handling systems, these relays are often used to control solenoid valves on pneumatic actuators. Multiple valves can be grouped and controlled by a single relay module. The relay’s robust design handles the inductive kickback from the solenoid coils effectively, protecting the PLC outputs from voltage spikes and extending their service life.