tams elektronik FCS Series Manual page 19

FCS modules
Transistors
Transistors are current amplifiers which convert low signals into
stronger ones. There are several types in different package forms
available. The type designation is printed on the component.
Transistors for a low power rating (e.g. BC types) have a
package in form of a half zylinder (SOT-package). The
three pins of bipolar transistors (e.g. BC types) are called
basis, emitter and collector (abbreviated with the letters B,
E, C in the circuit diagram).
Reed contacts (SRK)
Depending on their version reed contacts fulfill the task of
a closer or a change-over switch. They respond to a
magnetic field, thus making possible contactless switching
operations.
They consist of a glass bulb filled with a predective gas.
Sealed in the glass bulb are two or three reeds made of a
magnetic material.
When bending the legs of the glass bulb they can be easily damaged
through mechanical strain.
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