i-Autoc KSH Series Single-Phase Solid-State Relays

Product Description

The KSH series are single-phase solid-state relays (SSRs) featuring SCR output, designed for PCB mounting. They are widely used in various industrial applications and are suitable for resistive, inductive, and capacitive loads. These relays support load voltages of 240VAC, 480VAC, and 600VAC, with an output current rating of 25A.

Key Features:

• Zero-crossing or random-on switching
• Load current: 25A @ 24-660VAC
• SCR output
• DC input
• Optical isolation: ≥4000VACrms
• Built-in RC protection circuit
• Product complies with RoHS directive

Product Selection

The KSH series offers a flexible model selection based on load voltage, control type, load current, trigger type, and protection method.

Model Naming Convention:

KSH [Load Voltage Code] D [Load Current] [Trigger Type Code] [Protection Method Code] - [Customer Code]

• KSH Series: Single-phase AC output
• Load Voltage Codes: 240 (240VAC), 480 (480VAC), 600 (600VAC)
• Control Type: D (DC Control, 4-32VDC)
• Load Current: 25 (25 Amp)
• Trigger Type Codes: Blank (Zero-crossing), R (Random-on)
• Protection Method Codes: Blank (No RC protection), N (No RC protection), T (TVS protection)
• Customer Code: (XXX) - Optional

Available Models:

• 240VAC Load Voltage:
  • KSH240D25 (Zero-crossing, No RC)
  • KSH240D25N (Zero-crossing, No RC)
  • KSH240D25-T (Zero-crossing, TVS)
  • KSH240D25N-T (Zero-crossing, No RC, TVS)
  • KSH240D25R (Random-on, No RC)
  • KSH240D25RN (Random-on, No RC)
  • KSH240D25R-T (Random-on, TVS)
  • KSH240D25RN-T (Random-on, No RC, TVS)
• 480VAC Load Voltage:
  • KSH480D25 (Zero-crossing, No RC)
  • KSH480D25N (Zero-crossing, No RC)
  • KSH480D25-T (Zero-crossing, TVS)
  • KSH480D25N-T (Zero-crossing, No RC, TVS)
  • KSH480D25R (Random-on, No RC)
  • KSH480D25RN (Random-on, No RC)
  • KSH480D25R-T (Random-on, TVS)
  • KSH480D25RN-T (Random-on, No RC, TVS)
• 600VAC Load Voltage:
  • KSH600D25 (Zero-crossing, No RC)
  • KSH600D25N (Zero-crossing, No RC)
  • KSH600D25-T (Zero-crossing, TVS)
  • KSH600D25N-T (Zero-crossing, No RC, TVS)
  • KSH600D25R (Random-on, No RC)
  • KSH600D25RN (Random-on, No RC)
  • KSH600D25R-T (Random-on, TVS)
  • KSH600D25RN-T (Random-on, No RC, TVS)

Note: (1) 600VAC products do not have TVS protection options.

Technical Specifications

Input Parameters (Ta=25°C)

Output Parameters (Ta=25°C)

Other Parameters (Ta=25°C)

Application Areas

Suitable for lighting control, food machinery, medical equipment, elevators, electric control doors, and other industrial applications.

Outline Dimensions

The KSH series relays are compact units designed for PCB mounting. Key dimensions include a width of approximately 31.5mm ±0.2mm, a height of 25mm ±0.3mm, and a depth of approximately 36mm maximum. The PCB mounting pins are arranged in a standard configuration. The input terminals (DC control) are typically pins 1 and 2, while the output terminals (AC load) are pins 3 and 4.

[Diagram Description: A rectangular solid-state relay with four main terminals for AC load connection (labeled 3 and 4) and four pins for DC control input (labeled 1 and 2). The overall dimensions are approximately 31.5mm x 25mm x 36mm. The PCB mounting pins are visible.]

Wiring Diagram

The wiring diagram shows the standard connection for the KSH series solid-state relays. DC control voltage is applied to terminals 1 (+) and 2 (-). The AC load is connected in series with the output terminals, typically labeled 3 and 4.

[Diagram Description: A schematic showing a KSH series SSR. Input terminals are labeled 1 and 2 for DC control voltage (4-32VDC). Output terminals are labeled 3 and 4 for connecting an AC load (e.g., 240VAC, 25A). The internal SCR and isolation components are implied.]

Temperature Curve

The temperature curve illustrates the derating of the load current based on the ambient temperature. As the ambient temperature increases, the maximum allowable load current decreases to prevent overheating. The graph shows load current (A) on the Y-axis and ambient temperature (°C) on the X-axis. For instance, at 25°C, the current can be up to 25A, but this capacity reduces significantly at higher temperatures.

[Diagram Description: A line graph showing Load Current (A) on the vertical axis (from 0 to 25) and Ambient Temperature (°C) on the horizontal axis (from 0 to 80). A red line indicates the maximum current capacity, which starts at 25A at 25°C and decreases gradually to around 11.5A at 80°C. A blue line, possibly representing a different configuration or derating factor, shows a similar downward trend. A note indicates that the heatsink temperature should not exceed 85°C with forced air cooling.]

Precautions

1. When soldering, the temperature should not exceed 260°C for more than 10 seconds, or 350°C for more than 5 seconds, to prevent product damage.
2. When the ambient temperature is high, or when solid-state relays are mounted close together, users should consider derating the current capacity according to the temperature curve.

Safety Warnings

1. The product may generate heat during operation. Allow it to cool before touching.
2. Before installation or use, ensure all power sources are disconnected.
3. Verify all connections are secure before applying power.

Certification Standards