Component Designations - Kalmar DRF420-60S5 Maintenance Manual

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Prefix Description
B Converter from non-electric to electric signals or vice versa. Example: inductive sensor.
D Binary element, delay unit, memory. Example: control unit.
F Protective device. Example: fuse.
G Alternator, power supply device. Example: battery.
H Signal device. Example indicator light.
K Relay, contactor.
M Motor. Example: electric motor.
P Measuring instrument, testing equipment. Example: operating hour gauge.
R Resistor. Example: potentiometer.
S Electric switch for control circuit, selector. Example: switch.
X Outlet/socket, connecting device: Example: connection terminal
Y Electrically controlled mechanical device: Example: solenoid valve, hydraulic valve.
E Schematics – 11 Common electrics

Component designations

The components in circuit diagrams have a prefix and number, the
prefix describes the type of component, the number which compo-
nent.
Component list with component number, prefix and designation is
provided as an appendix after the circuit diagrams.
Maintenance manual DRF 400–450
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UDRF01.04GB