i-Autoc KSQF Series Three-Phase AC Output Solid State Relays
Product Overview and Technical Specifications
Product Description
The KSQF series products are three-phase AC solid-state relays (SSRs). They are designed for industrial control applications and feature an input control voltage range of 90~280VAC or 4~32VDC, with output current ratings available in 25A, 40A, 60A, and 80A. The load voltage range supported is 24~660VAC, utilizing SCR output technology.
Key Features
- Zero-crossing or random turn-on switching options.
- Dielectric strength of 4000Vrms for enhanced safety.
- Built-in RC snubber protection circuit.
- Photoelectric isolation for signal integrity.
- Compliant with the RoHS directive.
- Certifications include CE, CQC, TÜV, and S-mark (Note: TUV and S-mark certifications are not applicable to AC control series models).
Model Selection
The model number is structured to define the relay's specifications. The format is KSQF-Voltage-ControlType-Current-TriggerType-(CustomerCode).
- Series: KSQF
- Load Voltage: 480 (480VAC), 600 (600VAC)
- Control Type: D (DC control, 4~32VDC), A (AC control, 90~280VAC)
- Load Current: 25 (25A), 40 (40A), 60 (60A), 80 (80A)
- Trigger Type: R (Random type), Blank (Zero-crossing type)
- Customer Code: (XXX) - Optional customer-specific code.
Available Models
| Current | Control Type | Voltage | Zero-Crossing | Random Turn-On |
| 25A | DC (4~32VDC) | 480VAC | KSQF480D25 | KSQF480D25R |
| 600VAC | KSQF600D25 | KSQF600D25R | ||
| AC (90~280VAC) | 480VAC | KSQF480A25 | KSQF480A25R | |
| 600VAC | KSQF600A25 | KSQF600A25R | ||
| 40A | DC (4~32VDC) | 480VAC | KSQF480D40 | KSQF480D40R |
| 600VAC | KSQF600D40 | KSQF600D40R | ||
| AC (90~280VAC) | 480VAC | KSQF480A40 | KSQF480A40R | |
| 600VAC | KSQF600A40 | KSQF600A40R | ||
| 60A | DC (4~32VDC) | 480VAC | KSQF480D60 | KSQF480D60R |
| 600VAC | KSQF600D60 | KSQF600D60R | ||
| AC (90~280VAC) | 480VAC | KSQF480A60 | KSQF480A60R | |
| 600VAC | KSQF600A60 | KSQF600A60R | ||
| 80A | DC (4~32VDC) | 480VAC | KSQF480D80 | KSQF480D80R |
| 600VAC | KSQF600D80 | KSQF600D80R | ||
| AC (90~280VAC) | 480VAC | KSQF480A80 | KSQF480A80R | |
| 600VAC | KSQF600A80 | KSQF600A80R |
Technical Specifications
Input Parameters (Ta=25°C)
| Parameter | Control Type | Value |
| Control Voltage Range | DC Control | 4~32VDC |
| AC Control | 90~280VAC | |
| Ensure On-Voltage | DC Control | 4VDC |
| AC Control | 90VAC | |
| Ensure Off-Voltage | DC Control | 1VDC |
| AC Control | 15VAC | |
| Max Input Current | DC Control | 35mA (@32VDC) |
| AC Control | 30mA (@280VAC/50Hz) | |
| Max Reverse Polarity Voltage | DC Control | 32VDC |
Output Parameters (Ta=25°C)
| Parameter | Load Voltage Range (47~63Hz) | Value |
| Max Turn-On Time | DC Control | 1ms |
| AC Control | 10ms | |
| Max Turn-Off Time | DC Control | 40ms |
| AC Control | 10ms | |
| Max Surge Current (@10ms) | 25A | 300A |
| 40A | 500A | |
| 60A | 700A | |
| 80A | 1280A | |
| Max I²t Value (@10ms) | 25A | 450A²s |
| 40A | 1250A²s | |
| 60A | 2450A²s | |
| 80A | 8192A²s | |
| Max Transient Voltage | 480VAC | 1200Vpk |
| 600VAC | 1600Vpk | |
| Max Blocking Current (@ Rated Voltage) | 10mA | |
| Max On-State Voltage Drop (@ Rated Current) | 1.6Vrms | |
| Rate of Voltage Rise (dv/dt) | 500V/µs |
Other Parameters (Ta=25°C)
| Parameter | Test Condition | Value |
| Dielectric Strength | Input/Output | 4000Vrms |
| Input/Baseplate | 2500Vrms | |
| Insulation Resistance (@500VDC) | ≥1000mΩ | |
| Operating Temperature Range | -30°C to +80°C | |
| Storage Temperature Range | -30°C to +100°C | |
| Weight (Typical) | 25A, 40A | 385g |
| 60A, 80A | 530g |
Wiring Diagram
The relay features clearly labeled terminals for control input and three-phase AC output. The control input terminals are marked as AC~(DC+), which serves as the positive terminal for DC control and the AC input terminal for AC control. The negative terminal for DC control is marked as AC~(DC-). The three-phase AC output terminals are labeled L1, L2, and L3, connecting to the load.
Thermal Management and Temperature Curves
To ensure reliable operation, especially at higher ambient temperatures or continuous high load currents, proper thermal management is crucial. The document provides derating curves that illustrate the reduction in maximum allowable load current as ambient temperature increases. These curves are dependent on the thermal resistance of the heatsink used.
Heatsink Recommendations:
- KHS-D110: A standard finned aluminum heatsink suitable for moderate thermal loads.
- KHS-D110-F: An enhanced heatsink featuring an integrated cooling fan for superior heat dissipation, recommended for demanding applications or higher current ratings.
Derating Curves Description:
The graphs show 'Load Current (A)' on the x-axis and 'Ambient Temperature (°C)' on the y-axis. For each current rating (25A, 40A, 60A, 80A), multiple lines represent different thermal resistances:
- 0.35°C/W (e.g., with KHS-D110-F): Allows for the highest continuous current at elevated temperatures.
- 0.8°C/W (e.g., with KHS-D110): Offers a moderate derating curve.
- 0.92°C/W: Represents a higher thermal resistance, requiring more significant derating.
Users should consult these curves to select an appropriate heatsink and operating parameters to prevent overheating.
Dimensions
The physical dimensions of the KSQF series relays are designed for standard industrial panel mounting. The approximate overall dimensions are 78mm (width) x 105mm (height) x 45mm (depth). Mounting is facilitated by six M4 screw holes located on the unit, ensuring secure installation.
Applications
These solid-state relays are suitable for a wide range of industrial applications, including:
- Three-phase motor control.
- Temperature control systems for furnaces and ovens.
- Control of heating elements in large industrial ovens.
- General industrial automation and power switching.
Precautions and Safety Warnings
Precautions
- The heat generated by the relay during operation must be dissipated through the baseplate. Ensure close contact between the relay baseplate and the heatsink. Use thermal paste or thermal conductive pads for optimal heat transfer.
- Ensure all wiring connections are secure. Loose connections can cause abnormal heating and damage the product. Recommended wiring torque: Input terminals 0.2~0.5 N·m; Output terminals 0.98~1.37 N·m.
- When operating in high ambient temperatures, consult the derating curves and operate the product within its specified limits.
- Ensure the product is reliably grounded during installation and operation.
Safety Warnings
- [Warning] The side and baseplate of the product can become hot during operation. Allow the unit to cool down before touching.
- [Warning] Before installing or operating this product, ensure all power sources are disconnected.
- [Warning] Verify all connections are correct and secure before applying power.
