Siemens 3RM Motor Starter - Safety Integrity Level for ATEX Explosion Protection Applications

Create Date: 2024-8-30 12:03:23|Source: Siemens/Siemens

Questions:
Siemens 3RM Motor Starter - Safety Integrity Level for ATEX Explosion Protection Applications

Why do the 3RM11/3RM13 motor starters have a safety class of SIL2 for ATEX protection and SIL3 and PLe for functional safety applications?

Answer:

The 3RM11/3RM13 motor starters include two different protection functions.

One protection function is a safety application, and the other is an explosion protection application (ATEX).

1. Functional Safety:

Here, the purpose of protection is to identify and control dangerous conditions. In terms of safety functions, the 3RM11/3RM13 motor starter acts as an actuator subsystem that monitors its own faults. The architecture of the actuator subsystem can be achieved with HFT=1 (Hardware Fault Margin) and SIL3 according to the IEC62061 standard and PLe and Cat.4 according to ISO 13849-1

2. Explosion Protection (ATEX):

Here, the purpose of protection is to prevent the possibility of a fire in a dangerous area. For the 3RM11/3RM13 motor starters, it can provide overload protection for the motor or transformer. The 3RM11/3RM13 motor starters are available for ATEX Category 2 class. Therefore, the 3RM11/3RM13 overload protection function is single-channel, i.e. HFT=0, and based on the existing diagnostic capabilities, the 3RM11/3RM13 motor starter overload protection function can achieve SIL2

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