Selec RSS-SD1A290ZPL DC Input AC Output Solid State Relay 90A
Selec RSS-SD1A290ZPL Solid State Relay – 90A, 24–480VAC, DC Control, Zero-Cross, Inductive Type
Heavy-duty 90A SSR for inductive & resistive AC loads, zero-cross switching, 4–32VDC control input, 24–480VAC load voltage, LED indication, and IP20 protective design for industrial heating & motor applications.
Selec RSS-SD1A290ZPL is a 90A single-phase solid-state relay engineered for inductive loads such as solenoids, coils, small motors, and high-inrush heaters. It features a 4–32 VDC control input, 24–480 VAC load voltage, zero-cross switching, LED indication, high surge capability, and an IP20 touch-safe enclosure for harsh industrial environments.
KEY FEATURES
90A load current capacity
24–480 VAC wide load voltage range
4–32 VDC control signal
Zero-Cross switching for reduced EMI
Inductive-load version (“L”) for coils, solenoids, motors
LED ON-state indication
IP20 protective cover
Reverse voltage protection on input
High surge capacity for inrush loads
Panel-mount aluminium baseplate for heat dissipation
TECHNICAL SPECIFICATIONS
Input Specifications
| Parameter | Value |
|---|---|
| Control Voltage | 4–32 VDC |
| Control Current | 4–15 mA |
| Pickup Voltage | ≥3VDC |
| Dropout Voltage | ≤1VDC |
| Reverse Protection | 40 VDC |
| Input Impedance | 2 kΩ |
| LED Indicator | Yes |
| Response Time | ON/OFF: ½ cycle + 1 sec |
Output Specifications
| Parameter | Value |
|---|---|
| Rated Load Current | 90A |
| Load Voltage | 24–480 VAC |
| Minimum Load Current | 100 mA |
| On-State Voltage Drop | 1.6–1.8 V typical |
| Off-State Leakage | ≤10 mA |
| Transient Voltage | 800 Vpk |
| dv/dt | 1000 V/µsec |
| Surge Current (1 cycle) | 900–1200A (typical in 90A SSR class) |
| Load Type Compatibility | Inductive & resistive loads |
Mechanical & Environmental
| Parameter | Value |
|---|---|
| Housing | Glass-filled polyester, IP20 cover |
| Baseplate | Aluminium |
| Operating Temp | −30°C to +80°C |
| Storage Temp | −30°C to +100°C |
| Humidity | 93% RH non-condensing |
| Mounting | Panel mount, 2-hole |
Wiring & Torque
| Terminal | Wire Size | Torque |
|---|---|---|
| Input (M4) | 0.75–2.5 mm² | 1.2 N·m |
| Output (M5) | 1.5–10 mm² | 2.0 N·m |
APPLICATIONS
Solenoids and inductive valves
HVAC contractor replacement
Motor switching (low horsepower)
Plastic machine heaters & coils
Packaging machinery
Ovens and drying systems
Resistive or inductive industrial loads
WHAT’S IN THE BOX
Selec RSS-SD1A290ZPL SSR
IP20 protective cover
Mounting screws
User documentation
FAQS
Q1. What is the load current rating?
90A continuous (with proper heat sink).
Q2. Is it suitable for inductive loads?
Yes—“L” suffix = inductive-load optimized.
Q3. What is the control voltage?
4–32 VDC.
Q4. Is it zero-cross?
Yes—“ZP” = Zero-Cross version.
Q5. What load voltage range does it support?
24–480 VAC.
Q6. Does it need a heat sink?
Yes—mandatory for 90A operation.