Overview

The KS33-F series is a conventional panel-mount type Solid State Relay (SSR) designed for DC output applications. It features MOSFET output technology, photoelectric isolation, and a flip-top design compliant with IP20 protection. The SSR supports a wide range of input and output voltages and currents, making it suitable for various industrial and medical applications.

Key Features

• MOSFET output for efficient switching
• Photoelectric isolation between input and output with 2500V dielectric strength
• Low on-state resistance for reduced power loss
• Panel mount design with flip-top cover
• Input control voltage range: 4 to 32 VDC
• Output voltage options: 50V, 100V, 400V DC
• Output current ratings from 10A to 80A
• Good flame retardant performance and high reliability
• Suitable for U-shaped, circular, or tubular crimp terminal connections

Applications

Primarily used in lithium battery systems, testing and inspection equipment, and medical devices.

Model Selection Guide

The KS33-F series includes various models differentiated by load voltage and current ratings, for example:

• KS33-F/D-50D40-L: 50V load voltage, 40A current
• KS33-F/D-50D80-L: 50V load voltage, 80A current
• KS33-F/D-100D40-L: 100V load voltage, 40A current
• KS33-F/D-100D80-L: 100V load voltage, 80A current
• KS33-F/D-400D10-L: 400V load voltage, 10A current

General Specifications (at 25°C)

• Input control voltage: 4 to 32 VDC
• Must turn-on voltage: 4 VDC
• Must turn-off voltage: 1 VDC
• Max input current: 28 mA at 32 VDC
• Max reverse protection voltage: -32 VDC
• Insulation resistance: 1000 MΩ (at 500 VDC)
• Dielectric strength: 2500 VAC (input/output/base) for 1 minute
• Vibration resistance: 10-55 Hz, 1.5 mm amplitude
• Shock resistance: 980 m/s²
• Operating temperature range: -30°C to 80°C
• Storage temperature range: -30°C to 100°C
• Weight: Approximately 100 g

Output Specifications (at 25°C)

• Load voltage ranges: 3-50 VDC, 3-100 VDC, 3-400 VDC depending on model
• Load current ranges: 10A, 40A, 80A options
• Max off-state leakage current: 0.1 mA
• Max on-state voltage drop: varies by model (e.g., 0.64 V for 40A)
• Max on-state resistance: ranges from 8 mΩ to 37.5 mΩ
• Max turn-on and turn-off times: 2 ms each
• Max surge current (10 ms): varies by model, e.g., 100 A peak for some

Mechanical and Wiring Details

The SSR features panel mounting holes and a wiring diagram suitable for control signal and load connections. The design supports various terminal types for secure connections.

Characteristic Curves and Thermal Performance

Graphs illustrate the relationship between ambient temperature and maximum load current for different models, both with and without heat sinks. Heat sinks such as HF92B-80, HF92B-150A, and HF92B-120 improve current handling capacity. Fan cooling with specified airflow (≥5 CFM or ≥20 CFM) further enhances performance.

Additional curves show the maximum permissible non-repetitive peak surge current versus energizing continuance time, providing guidance on transient current handling.

Critical Parameters and Recommendations

• Ensure control voltage remains within 4-32 VDC for reliable operation.
• Observe maximum load current limits relative to ambient temperature and cooling conditions.
• Use appropriate heat sinks and cooling fans to maintain SSR within safe operating temperatures under high load.
• Follow wiring diagrams carefully to ensure correct control and load connections.
• Note dielectric strength and isolation ratings to maintain safety and prevent damage.

Summary

The KS33-F series SSRs provide versatile, reliable DC switching solutions with multiple voltage and current options. Their robust design, including photoelectric isolation and MOSFET output, ensures high performance in demanding applications such as battery management, medical devices, and testing equipment. Proper thermal management and adherence to electrical specifications are essential for optimal operation.