4-20mA Surge Protection Device SPD 4 t...
4-20mA Surge Protection Device SPD 4 to 20mA
Three-stage SPD-20mA surge protection device providing standard-compliant protection against power surges, transient overvoltages, and loop disturbances with three coordinated stages of suppression. Housed in a DIN rail panel mount case with protective earth ground.
Key Features
- Three-stage hybrid surge protection (GDT, decoupling impedance, TVS)
- Designed for 0–20mA and 4–20mA industrial current loop circuits
- Transparent to digital signals including HART communication
- Low loop series burden with minimal voltage drop
- Ultra-fast nanosecond response time (< 1 ns)
- Protects PLCs, DCS cards, and field transmitters against transients
- Standard 35 mm DIN rail mountable enclosure with protective earth connection
- Dimensions: 60 mm × 50 mm × 20 mm
Ordering Information
| Product Code | Description |
|---|---|
| SPD-20MA | 4-20mA Surge Protection Device SPD 4 to 20mA |
| SPD-24V-DC | Surge Protection Device 24V DC SPD |
| SPD-RS485 | Surge Protection Device RS485 |
| AC-420-420 | Signal Isolator 4 20ma |
| USS20M24V-D | Current Source Simulator 0/4 to 20mA |
Applications
- Industrial Automation & Process Control: Reliable signal interfacing and device connectivity across automated production lines.
- SCADA & PLC Integration: Seamless communication between field instrumentation and control systems.
- Control Panel Building: Compact 35 mm DIN rail mounting for clean and space-efficient cabinet wiring.
- OEM Equipment & Diagnostics: Robust electrical protection and standard industrial ratings.
Specifications
| Parameter | Value |
|---|---|
| Mounting Type | 35 mm DIN Rail Mounting |
| Dimensions | 60 mm x 50 mm x 20 mm (L x W x H) |
| Enclosure Material | Industrial ABS plastic |
| Operating Temperature | -10 °C to +60 °C |
| Storage Temperature | -40 °C to +85 °C |
| Relative Humidity | 5% to 95% RH (non-condensing) |
Electrical Specifications
| Parameter | Specification |
|---|---|
| Operating Voltage | 24V DC |
| Nominal Discharge Current (In) | 5 kA (8/20 µs impulse) |
| Max Discharge Current (Imax) | 10 kA (8/20 µs impulse) |
| Response Time (tA) | < 1 ns (TVS) |
| Protection Technology | Multi-stage Hybrid |
Isolation & Protection Specifications
| Parameter | Value | Standard / Notes |
|---|---|---|
| Voltage Clamping Level | Low Clamping | High-efficiency multi-stage surge attenuation |
| Surge Standard | IEC 61643-21 / IEC 61000-4-5 | Class-compliant industrial transient immunity |
| Grounding Interface | Integrated PE Terminal | Low-impedance earth DIN rail connection |
Mechanical Dimensions
Terminal Details & Wiring
Terminal Connections
| Terminal Block | Pin | Label | Function | Description |
|---|---|---|---|---|
| Line In (Unprotected) | 1 | IN + | 4–20mA In (+) | Unprotected field loop input from transmitter (+) |
| (Bottom Block) | 2 | IN - | 4–20mA In (-) | Unprotected field loop input ground return (-) |
| Line Out (Protected) | 3 | OUT + | 4–20mA Out (+) | Protected clean loop output to PLC/DCS input (+) |
| (Top Block) | 4 | OUT - | 4–20mA Out (-) | Protected clean loop ground return to PLC/DCS (-) |
| Ground Terminal | PE | PE | Earth Ground | Low-impedance 35 mm DIN rail protective earth ground |
Revision History
| Revision | Date | Description of Change |
|---|---|---|
| Rev 1.0 | 2026-09-09 | Initial datasheet release |
Get the latest version of this datasheet : click here..
Support
Website: www.veawe.io
Email: info@veawe.io