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Operating Instructions – Explosion-Proof AC Motors DR63/eDR63, DVE250/280
5
Motors of category 2G, 2GD, 3D and 3GD
Electrical Installation
5.14.3 Temperature classes
The motors are authorized for temperature classes T3 or T4.
The temperature class of the motor variants 3D and 3GD is listed on the nameplate or
in the declaration of conformity in the appendix.
The temperature class of the motor variants 2G and 2GD is listed in the type examina-
tion certificate that is enclosed with each motor.
5.14.4 Surface temperature
For the surface temperature of the motor, refer to the nameplate, the declaration of con-
formity, or the type examination certificate.
5.14.5 Protection against impermissibly high surface temperatures
Motors for hazardous locations ensure safe operation under normal operating condi-
tions. The motor must be switched off securely in the case of overload to avoid the risk
of impermissibly high surface temperatures.
Motor protection must be in accordance with the respective approvals. There are 2 basic
motor protection types. The respective options can be added if available:
Motor protection types
Option
A:
Motor current circuit breaker
TF
B:
Positive temperature coefficient thermistor
(PTC resistor: SEW designation: TF)
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