Power and Signal Line Protection (RayDat SUH-2 PS)
Raycap RayDat SUH-2 PS is a modular SPD developed for systems where mounting space is limited, but both signal and power lines need protection. It protects 24 V power and 24 V signal lines in a single module. It is designed for systems that carry power and data together, such as CAN bus and DeviceNet. Key features include a 30 MHz operating frequency, 20 kA discharge capacity, and active connection lines during module replacement.
In some systems, both power and signal lines require protection at a single point, but panel space for two separate modules is often unavailable. The RayDat SUH-2 PS was developed for this need: it protects both 24 V power and 24 V data lines within a single 12 mm module.
This series is specifically designed for systems with one power supply and one signal line — such as CAN bus, DeviceNet, and similar. The device protects lines against both lightning-induced overvoltages and electrostatic discharges from switching transients within the building.
A critical aspect of the design is that the signal line circuit is configured to minimize inter-capacitance and shunt capacitance. This increases the operating frequency to up to 30 MHz — meaning the addition of protection does not reduce communication speed.
The two lines are handled with different protection topologies:
- Data line: GDT (coarse) + diode block (fine) + series resistor (1.6–2.0 Ω) + thermo-clip. Response time < 1 ns, residual voltage < 70 V, cutoff frequency 30 MHz.
- Power line: MOV + bidirectional TVS diode + inductance (15 µH) + thermal disconnector (TD). 3 A load current, very low series resistance (< 0.2 Ω), residual voltage < 100 V.
The power line operates at 24 V AC / 30 V DC nominal voltage (Uc: 28 V AC / 40 V DC), the data line is 24 V DC (Uc: 28 V).
Connection lines remain active when the module is removed from the base — module replacement does not stop the system. The device is equipped with screw terminals, is 35 mm DIN rail mounted, and is only 12 mm wide.
The product complies with IEC/EN 61643-21 standard. Classification: D1 / C1 / C2 / C3.
- Protection for 2 signal lines + 1 power line in a single module
- For panels with limited mounting space — only 12 mm width
- Very high impulse current ratings (In 10 kA, Imax 20 kA)
- Connection lines remain active during module replacement
- Easy connection with screw terminals
- For protocols requiring power + signal protection — CAN bus, DeviceNet
- Protection against switching transients and electrostatic discharge
- Minimized inter-line and shunt capacitance — 30 MHz operating frequency
- Data line: GDT + diode block + thermo-clip
- Power line: MOV + TVS diode + inductance + thermal disconnector
- Response time: < 1 ns
- 35 mm DIN rail mounting (IEC/EN 60715)
- Protection class: IP 20 (enclosed)
- Housing: gray thermoplastic, V-0 flame resistance
- Operating temperature: -40 °C … +80 °C
- Classification: D1 / C1 / C2 / C3
- Standard: IEC/EN 61643-21
Electrical values
| Data Line | Power Line | |
|---|---|---|
| Protected lines | 2 (1 data + 1 power line) | |
| Nominal operating voltage Un | 24 V DC | 24 V AC / 30 V DC |
| Max. continuous operating voltage Uc | 28 V | 28 V AC / 40 V DC |
| Nominal load current IL (25 °C) | 1 A | 3 A |
| C2 In (8/20 µs) | 10 kA | 10 kA |
| Imax (8/20 µs) | 20 kA | 20 kA |
| D1 Iimp (10/350 µs) | 2.5 kA | — |
| Residual voltage @5 kA Ures | < 70 V | < 100 V |
| Nominal sparkover voltage (line-ground) | 31 – 37 V | 90 – 110 V |
| Nominal sparkover voltage (line-line) | 31 – 37 V | 42 – 52 V |
| Response time tA | < 1 ns | < 1 ns |
| Insulation resistance Riso | ≥ 28 MΩ | ≥ 40 MΩ |
| Series resistance per path R | 1.6 – 2.0 Ω | < 0.2 Ω |
| Series inductance L | — | 15 µH |
| Transverse capacitance C | 50 pF | 6.0 nF |
| Cutoff frequency fG | 30 MHz | 1 kHz |
Mechanical
- Dimensions: 12 mm width (DIN 43880 2/3 TE) — Weight: 72 g (module: 34 g)
- Terminal cross-section (max.): 4 mm² (stranded)
- Terminal tightening torque: 0.5 Nm
- Mounting: 35 mm DIN rail (IEC/EN 60715)
- Packaging: 87 × 15 × 102 mm — Min. package quantity: 15
RayDat SUH-2 PS is used in applications requiring combined power and signal protection:
- CAN bus networks — Segments carrying power + signal on the same cable
- DeviceNet networks — Industrial device-level communication
- 24 V DC/AC power + signal lines — Dual protection at a single point
- Panels with limited mounting space — Single module instead of two separate modules
- Field device connection points — Sensor and actuator power supplies
- Automation and control panels — PLC field bus connections
- Building automation systems — Against switching transients
- Environments with electrostatic discharge risk — Internal building transients
- Power lines up to 3 A — Device power outputs
- Communication lines up to 30 MHz — High-speed bus segments
- Facilities requiring continuous operation — Lines remain active during module replacement
- Harsh industrial environments — -40 °C … +80 °C operating range
