The HIMA BT 21 LE/S is a 19-inch subrack that is part of the HIMA Planar4 System.

It is a metal enclosure that provides a mounting frame for electronic equipment. The subrack has 21 slots for mounting electronic modules.

The subrack has 21 slots for mounting electronic modules. The slots are spaced vertically at a standard interval that allows different types of modules to be mounted in the subrack. The subrack also has a variety of features that help to keep the electronic modules cool and protected, such as ventilation holes and a front door.

HIMA is a German company that manufactures industrial automation products. The Planar4 System is a safety instrumented system (SIS) that is used to control industrial processes. SIS systems are designed to shut down a process in the event of a safety hazard.

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