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PEPPERL+FUCHSThe KFD2-RSH-1.2E.L2 is a 1-channel signal conditioner (relay module) launched by Pepperl+Fuchs.
It is mainly used in industrial automation systems, featuring high safety and reliable line fault detection capabilities.

| Brand | Pepperl+Fuchs |
| Model / Part Number | KFD2-RSH-1.2E.L2 |
| Material Number (MNR) | 70172205 |
| Safety Integrity Class (SIL) | Up to SIL 3 |
| System Capability (SC) | SC 3 |
| Explosion-proof Certification | II 3G Ex nC ec IIC T4 Gc |
| Rated Supply Voltage | 19 ~ 26.4 V DC |
| Power Consumption | < 1.7 W |
| Input Terminals | 7+, 8- |
| Case Dimensions | 20 mm × 119 mm × 115 mm (Type B2 case) |
| Mounting Method | 35 mm standard DIN rail |
| Protection Rating | IP20 |
| Operating Temperature | -20 ~ 60 °C |
Q: In which industrial scenarios is this module primarily used?
A: Given its core features such as SIL 3 high safety rating, Line Fault Detection (LFT), and explosion-proof certification, the KFD2-RSH-1.2E.L2 is mainly used in industrial automation fields with extremely high requirements for safety and reliability.
Q: What's the difference between it and a regular relay module?
A: Although its name includes "relay module," the KFD2-RSH-1.2E.L2 is an industrial safety signal conditioner. Compared to common relay modules, it differs fundamentally in its design goals, safety mechanisms, and application scenarios. Simply put, a regular relay module is like a household light switch, responsible for turning things on and off; while the KFD2-RSH-1.2E.L2 is like the emergency braking system on an airplane or high-speed train, not only responsible for control but also constantly self-checking to ensure safety in the most unforeseen circumstances.
Q: In what situations must such safety relays be used?
A: In industrial automation and process control, safety relays must be used when personnel safety, protection of high-risk equipment, and environmental safety are involved. Ordinary relays are responsible for getting machines moving, while safety relays are responsible for ensuring that machines can be stopped and brought to a complete halt in dangerous situations.
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