Why Choose the Finder 77.01.9.024.9125 Solid State Relay?
The Finder 77.01.9.024.9125 is a compact 7 A DC-output solid state relay (SSR) designed for reliable, silent and high-speed switching in industrial automation, electrical control and railway applications. Part of the Finder Series 77 modular solid state relay range, this device uses MOSFET semiconductor switching technology to control DC electrical loads without conventional moving relay contacts.
Designed for 125 V DC nominal output applications, the Finder 77.01.9.024.9125 offers a 43–140 V DC switching voltage range and a rated load current of 7 A. Its control input operates over 4–32 V DC, with a nominal control voltage range of 6–24 V DC, making it suitable for integration into compatible PLC outputs, electronic controllers and industrial automation systems.
Featuring one normally open solid state output (1 NO / SPST-NO), high-speed switching, low control power consumption and 4 kV impulse insulation between input and output, this relay provides an efficient alternative to conventional electromechanical relays. Its slim 17.5 mm housing and 35 mm DIN rail mounting allow straightforward installation in compact industrial control panels.
Key Advantages
- 7 A rated DC output current for compatible industrial switching applications.
- 43–140 V DC switching voltage range for nominal 125 V DC electrical systems.
- 4–32 V DC control input range for integration with compatible electronic control equipment.
- MOSFET solid state switching eliminates mechanical contact movement.
- Silent operation without mechanical relay clicking.
- Spark-free and contact bounce-free switching for dependable electronic operation.
- Fast switching response with a typical operate time of 0.05 ms.
- 4 kV input-to-output impulse insulation for electrical separation between control and load circuits.
- Low 0.4 W rated input power for efficient control circuit operation.
- 17.5 mm slim housing for space-efficient control panel installation.
- 35 mm DIN rail mounting for convenient integration into industrial electrical assemblies.
- Suitable for railway applications where the specified installation requirements are met.
Key Features
- Finder Series 77 modular solid state relay.
- Type 77.01 single-channel DC-output configuration.
- MOSFET semiconductor switching technology.
- One normally open output (1 NO / SPST-NO).
- Rated output current of 7 A.
- Nominal output voltage of 125 V DC.
- DC output switching range of 43–140 V DC.
- Nominal control voltage range of 6–24 V DC.
- Operating control voltage range of 4–32 V DC.
- Rated control input power of 0.4 W.
- Maximum peak output current of 60 A for 10 ms.
- Fast turn-on switching characteristic.
- Typical operate time of 0.05 ms.
- Typical release time of 2 ms.
- High electrical endurance without mechanical contact wear.
- 4 kV impulse insulation between input and output.
- Integrated short-circuit protection features within the specified relay design.
- Screw-type electrical terminals.
- 17.5 mm modular housing width.
- 35 mm DIN rail mounting.
- IP20 protection classification.
Technical Specifications
- Manufacturer: Finder
- Series: 77
- Type: 77.01
- Manufacturer part number: 77.01.9.024.9125
- Product category: Solid State Relays
- Product type: Modular DC-output solid state relay
- Switching technology: MOSFET
- Output configuration: 1 NO (SPST-NO)
- Number of output channels: 1
- Output voltage type: DC
- Rated output voltage: 125 V DC
- Switching voltage range: 43–140 V DC
- Rated output current: 7 A
- Maximum peak current (10 ms): 60 A
- Rated DC-13 load current: 2.5 A
- Minimum switching current: 50 mA
- Typical OFF-state leakage current: 6 mA
- Maximum ON-state voltage drop at 25 °C and rated current: 0.2 V
- Power loss at rated output current: 1.5 W
- Control input voltage type: DC
- Nominal control voltage range: 6–24 V DC
- Control input operating range: 4–32 V DC
- Must drop-out voltage: 3 V DC
- Rated control input power: 0.4 W
- Typical operate time: 0.05 ms
- Typical release time: 2 ms
- Electrical endurance: 10 million cycles
- Input-to-output impulse insulation: 4 kV (1.2/50 µs)
- Operating temperature: −20 to +70 °C, subject to load derating requirements
- Protection rating: IP20
- Mounting method: 35 mm DIN rail (EN 60715)
- Terminal type: Screw terminals
- Housing width: 17.5 mm
- Housing height: 88.8 mm
- Housing depth: 60.8 mm
- Approvals: CE, UKCA, cULus and EAC
- EAN / GTIN-13: 8012823411873
High-Speed MOSFET Switching for DC Electrical Loads
The Finder 77.01.9.024.9125 uses MOSFET semiconductor technology to switch DC electrical loads without the moving contacts found in conventional electromechanical relays. When the control input is activated within its specified operating voltage range, the semiconductor output switches on and allows current to flow through the connected DC load.
Because the switching mechanism contains no moving contacts, the relay operates silently and without mechanical contact bounce. This makes it particularly useful in applications requiring frequent switching, reduced acoustic noise and high electrical endurance.
The relay supports a 43–140 V DC output switching range, with a nominal output voltage of 125 V DC. Its 7 A rated output current makes it suitable for appropriately rated DC loads, while the specified 60 A peak current capability for 10 ms accommodates short-duration current peaks within the manufacturer's operating limits.
With a typical 0.05 ms operate time and 2 ms release time, the Finder 77.01.9.024.9125 offers rapid response to electronic control signals. Its low 0.4 W input power supports integration into compatible industrial control circuits.
The device also provides 4 kV impulse insulation between the control input and load output, supporting electrical separation between the two circuits. This is especially useful in automation installations where low-voltage control equipment operates higher-voltage DC loads.
Unlike a mechanical relay, a solid state relay can exhibit a small leakage current when switched off. For this model, the typical OFF-state leakage current is 6 mA. Designers should consider this characteristic when connecting sensitive loads or circuits requiring complete galvanic disconnection.
The Finder 77.01.9.024.9125 should be used with appropriately selected protective devices, wiring and thermal management. Load current, ambient temperature and the nature of the connected load must all be considered when designing the installation.
Typical Applications
- Industrial DC load switching.
- 125 V DC electrical control systems.
- Railway electrical control and automation equipment.
- Industrial machinery and manufacturing systems.
- Programmable logic controller (PLC) output interfaces.
- DC solenoid and electromagnetic valve control.
- Electromagnet and actuator switching.
- Industrial process automation.
- Electrical control cabinets and distribution panels.
- High-frequency switching applications requiring electronic relay operation.
- Equipment requiring silent switching.
- OEM electrical and electronic control assemblies.
