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Product Overview
The CHENZHU CZLBX-48 surge protective device protects field instruments from lightning-induced surges and transient overvoltage events.
It is designed specifically for two-wire signal lines commonly used within industrial automation and hazardous process environments.
Moreover, the device combines high discharge capacity with explosion-proof certification, ensuring safety without sacrificing signal integrity.
Therefore, critical measurement and communication systems remain stable during severe electrical disturbances and harsh operating conditions.
Key Functional Highlights
The CZLBX-48 delivers a 20 kA surge discharge capacity, providing strong protection against direct and induced lightning currents.
In addition, its one nanosecond response time limits voltage stress on sensitive electronics during fast transient events.
The parallel installation concept simplifies field wiring while maintaining continuous signal flow during normal operation.
Furthermore, certified explosion-proof ratings support safe deployment within Zone 0, Zone 1, and combustible dust environments.
Technical Specifications
Rated Operating Voltage (Un): 24 VDC
Maximum Continuous Voltage (Uc): 48 VDC
Rated Operating Current (IL): 500 mA
Response Time: 1 ns
Signal Bandwidth: 10 MHz (–0.5 dB)
Nominal Discharge Current (In, 8/20 µs): 10 kA
Maximum Discharge Current (Imax, 8/20 µs): 20 kA
Voltage Protection Level (Up, 8/20 µs): 60 V
Explosion Protection: Ex ia IIC T6…T4 Ga; Ex ia IIIC T85℃…T135℃ Da; Ex db IIC T6…T4 Gb
Safety Integrity Level: SIL3, SFF 98.54%
Operating Temperature: –40 to +85 °C (Gas T4), –40 to +70 °C (Gas T6)
Storage Temperature: –40 to +85 °C
Ingress Protection: IP67
Installation Method: Parallel, two-wire, 3/4 inch NPT external thread
Typical Applications and Integration
The CZLBX-48 is widely applied to thermocouples, RTDs, and analog input measurement loops.
For instance, it protects RS-485 communication lines in distributed control and safety instrumented systems.
Moreover, digital input and output channels benefit from reduced downtime caused by surge-related failures.
Therefore, petrochemical plants, power stations, and automated production lines commonly specify this device.
FAQ
Q1: Can the CZLBX-48 be installed in hazardous areas with explosive gases?
Yes, the device carries certified Ex ia and Ex db ratings suitable for Zone 0 and Zone 1 installations.
Q2: Does the SPD affect normal signal transmission accuracy?
No, the wide ten megahertz bandwidth preserves signal quality during standard operating conditions.
Q3: Is the CZLBX-48 suitable for safety instrumented systems?
Yes, the SIL3 rating and high SFF value support use within critical safety loops.
Q4: How is the device typically installed in the field?
It installs in parallel using a 3/4 inch NPT threaded connection near the protected instrument.
