In today's era of rapid information technology development, the application of various electronic devices is becoming more widespread. Lower operating voltage and lower overvoltage tolerance make them particularly sensitive to overvoltage in system signals. This is especially true in the field of automation, which involves a large amount of signal transmission and thus requires the installation of numerous signal surge protection device for transient overvoltage protection.
While ensuring surge protection performance, SPD size becomes increasingly important. The more SPD units that can be installed in a single control cabinet, the fewer control cabinets are needed, thereby reducing overall costs.
There is such asignal SPD with good performance, samll size, high quality:
Compact and space-saving
Great performance
User-friendly

CHENZHU C series slim type signal surge protection device complies with the SH/T3164-2021 petrochemical instrument system lightning protection design specification
The basic parameters of signal-type surge protectors should meet the specifications in Table 7.3.
Table 7.3 Basic parameters of signal-type surge protectors
Parameter Name | Parameter Value | Application | |
Maximum continuous operating voltage | Uc≥32V | 24V DC powered instruments | When the DC power supply voltage might>32V, Uc≥36V |
Rated working current | IN≥150mA | Two-wire, three-wire, and four-wire4mA~20mA signal instruments(including those with HART communication signals) | |
IN≥600mA | 24V DC powered current greater than 60mA three-wire, and four-wire4mA~20mA signal instruments | ||
Nominal discharge current | ln≥10kA | Signal type |
CHENZHU C series slim type signal surge protection device can reach

Smaller product size
But high lightning protection capability
Nominal discharge current In10kA
Type test report, SIL3 and multiple authoritative certifications for assured applications
As slim as 6.0mm
From slim → to slimmer
Thinnest is only3.5mm
2 thickness options to choose from

Flexibly Customizable Identification Strip for Convenient Labeling

35mm DIN rail mount
Direct grounding through rail
Option for screw-type wiring, stable and reliable
Option for plug-in wiring, completes in one action

In explosive atmospheres, intrinsically safe SPD options are available.
It can protect RS-232, RS-485, RTD, TC, AI, AO, DI, DO, and other signal interfaces.