Digital Systems – Narrow Line
Raycap Narrow Line (NL) bus and digital system protection solutions provide maximum density in the panel with their narrow and compact design, only 6.2 mm wide. Designed to protect industrial fieldbus systems (CAN, Profibus, RS485, etc.). It stands out with a frequency range of up to 120 MHz, remote monitoring (transmitter/receiver unit) for all variants, and a structure that does not interrupt the operation of other modules during module replacement.
Bus systems control almost every aspect of communication between connected equipment in today's smart homes, offices, and factories. As connected equipment becomes more centralized, it becomes even more necessary to protect these systems against internal or external surges.
Raycap Narrow Line products meet the diverse requirements of industrial applications with different signal types and operating voltages.
The most distinctive feature of the series is its 6.2 mm width — narrower than half of classic modules. The products are designed for combined use: a very high level of protection, which increases equipment reliability and lifespan, is achieved by stacking the modules side-by-side.
Individual modules can be added or replaced without interrupting the operation of others in the stack. This makes it possible to add protection to an active line later or replace a faulty module without system downtime.
Remote monitoring can be performed via transmitter and receiver units available for all product variants — fault information is transferred to the central monitoring system. The green flag / red flag indicator on the front panel provides on-site control.
Product families:
RayDat NSB-3 Series — Standard model for industrial fieldbus systems. Protects 1 line / 3 conductors (signal pair + shield/signal ground). 5, 12, 24, 48 V DC. Frequency up to 120 MHz. GDT (coarse) + diode block (fine) structure.
RayDat NSB-3 LF Series — Low frequency (LF) version. 5, 12, 24 V DC. 550 kHz – 2 MHz. Offers lower protection level (Up) — 80–160 V line-to-line. Bidirectional TVS diode structure.
Products comply with IEC/EN 61643-21 and UL 497B 4th Edition standards. Classification: D1 / C1 / C2 / C3. Quick-connect terminals and various shield-handling options are offered.
- Narrow and compact design — only 6.2 mm wide
- Very high impulse current ratings (In 10 kA)
- Quick-connect terminals
- Various shield-handling options
- Connection lines remain active during module replacement — other modules in the stack are not affected
- Remote monitoring for all variants (transmitter + receiver unit)
- Modular structure designed for combined use
- 1 line / 3 conductor protection (signal pair + shield/signal ground)
- Multi-stage hybrid protection: GDT (coarse) + diode block / TVS (fine)
- Response time: < 1 ns
- Thermal protection
- Status indicator: green flag / red flag
- Up to 120 MHz frequency range (LF series: 550 kHz – 2 MHz)
- 35 mm DIN rail mounting (IEC/EN 60715)
- Protection class: IP 20 (embedded)
- Housing: gray thermoplastic, V-0 flame resistance
- Operating temperature: -40 °C … +80 °C
- Classification: D1 / C1 / C2 / C3
- Standards: IEC/EN 61643-21, UL 497B 4th Edition
RayDat NSB-3 Series (standard, 120 MHz)
| 5 | 12 | 24 | 48 | |
|---|---|---|---|---|
| Protected line | 1 line (3 conductors) | |||
| Nominal operating voltage Un | 5 V | 12 V | 24 V | 48 V |
| Max. continuous operating voltage Uc | 8.5 V | 15 V | 30 V | 54 V |
| Nominal load current IL (40 °C / 70 °C) | 800 mA / 600 mA | |||
| C2 In (8/20 µs) line-line / line-ground | 10 kA / 10 kA | |||
| C2 total In (8/20 µs) | 10 kA | |||
| C2 protection level Up (line-line) | 140 V | 150 V | 170 V | 210 V |
| C2 protection level Up (line-ground) | 1100 V | 1100 V | 1100 V | 1150 V |
| C3 protection level Up (line-line) | 24 V | 36 V | 70 V | 130 V |
| C3 protection level Up (line-ground) | 650 V | 660 V | 680 V | 740 V |
| D1 Iimp (10/350 µs) line-line / line-ground | 2.5 kA / 2.5 kA | |||
| Nominal sparkover voltage (line-line) | 9–25 V | 16–33 V | 33–51 V | 60–81 V |
| Insulation resistance Riso (line-line) | > 170 kΩ | > 7.5 MΩ | > 15 MΩ | > 27 MΩ |
| Series resistance per path R | 1 Ω | |||
| Capacitance (line-line / line-ground) | typ. 25 pF / 10 pF | |||
| Max. frequency fG | 120 MHz | |||
| Order code | 7088.09 | 7088.11 | 7088.13 | 7088.54 |
| Replacement module | 7088.10 | 7088.12 | 7088.14 | 7088.55 |
RayDat NSB-3 LF Series (low frequency, lower Up)
| 5 | 12 | 24 | |
|---|---|---|---|
| Protected line | 1 line (3 conductors) | ||
| Nominal operating voltage Un | 5 V | 12 V | 24 V |
| Max. continuous operating voltage Uc | 8.5 V | 15 V | 30 V |
| Nominal load current IL (40 °C / 70 °C) | 800 mA / 600 mA | ||
| C2 In (8/20 µs) line-line / line-ground | 10 kA / 10 kA | ||
| C2 protection level Up (line-line) | 80 V | 100 V | 160 V |
| C2 protection level Up (line-ground) | 1100 V | 1100 V | 1100 V |
| C3 protection level Up (line-line) | 48 V | 60 V | 120 V |
| C3 protection level Up (line-ground) | 650 V | 660 V | 680 V |
| D1 Iimp (10/350 µs) | 2.5 kA | ||
| Insulation resistance Riso (line-line) | > 340 kΩ | > 15 MΩ | > 30 MΩ |
| Capacitance (line-line) | typ. 5 nF | typ. 2 nF | typ. 0.8 nF |
| Capacitance (line-ground) | typ. 10 pF | ||
| Max. frequency fG | 550 kHz | 1.2 MHz | 2 MHz |
| Order code | 7088.15 | 7088.17 | 7088.19 |
| Replacement module | 7088.16 | 7088.18 | 7088.20 |
Mechanical (both series)
- Dimensions: 6.2 mm width (DIN 43880) — Weight: 60 g (module: 16 g)
- Conductor cross-section (max.): 4 mm² (solid) / 2.5 mm² (flexible)
- Mounting: 35 mm DIN rail (IEC/EN 60715)
- Packaging: 113 × 111 × 11 mm — Min. package quantity: 15
RayDat Narrow Line digital series is used in the protection of industrial communication networks:
- Industrial fieldbus systems — CAN Bus, Profibus DP, RS 485, DeviceNet
- Smart factory automation — Connected equipment communication
- Smart building and office systems — Building automation bus lines
- PLC and controller communication ports — Control system side
- Panels with critical space constraints — Maximum density with 6.2 mm width
- High-speed communication lines — Up to 120 MHz (NSB-3)
- Low-frequency sensitive bus lines — Lines requiring lower Up (LF series)
- Shielded bus cables — With various shield-handling options
- Marshalling and communication panels — Points where many bus segments converge
- Together with Narrow Line analog/DC modules — Complete segment protection on the same rail
- Facilities requiring continuous operation — Module replacement without affecting other modules in the stack
- Remotely monitored facilities — SCADA integration with transmitter/receiver unit
- Systems with subsequently added protection — Module addition without stopping the active line
- Harsh industrial environments — -40 °C … +80 °C operating range
