Siemens SIRIUS Series System Manual

Configuration
4.2 Supply possibilities in main circuit
SIRIUS 3RA6 Compact Starter
36 System Manual, 02/2008, GWA 4NEB 560 0601-02 DS 02
4.2.4 Infeed in accordance with UL 508 (Type E)
According to UL 508 and CSA 22.2, a motor feeder is required to fulfill 4 sub-functions:
Table 4-5 Sub-functions of motor feeders according to UL 508 and CSA 22.2
Sub-function Description
Disconnect The feeder component has an actuator, which will only indicate
the "OFF" switch position if all the main contacts are open and
are isolating the disconnected circuit from the supply system up
to the specified voltage U
imp
. It is not permissible for an
overvoltage in the supply system up to the specified voltage
U
imp
to flash over to the disconnected circuit via the contacts.
Branch Circuit Protection The feeder component must protect the cable running to the
motor, the contactor and the overload relay (if installed) in the
event of a short circuit.
Motor Control The feeder component turns the motor "ON" or "OFF" under
normal switching duty conditions.
Motor Overload The feeder component must protect the motor from damage in
the event of an overload.
To ensure the provision of these 4 sub-functions, the motor feeder can be made up of
various feeder components, e.g. circuit breaker, contactor, fuse, etc. Depending on which
feeder components are used and the sub-functions that these components perform, the
motor feeders are sorted into the following categories in accordance with UL 508: Type A, B,
C, D, E, and Type F.
Table 4-6 Categorization of motor feeders in accordance with UL 508
Category Motor feeder
Type A and Type B Each sub-function is provided by a separate feeder component.
1)
Type C and Type D "The Disconnect" and "Branch Circuit Protection" sub-functions are provided
by the same feeder component. All other sub-functions are provided by
separate feeder components.
1)
Type E All sub-functions are provided by a single feeder component.
Type F "Motor Control" is provided by a separate feeder component. All other
sub-functions are provided by a single feeder component.
1) For more detailed information, please refer to UL 508.
The compact starter is a circuit breaker with an integrated contactor operating mechanism.
This means that it provides all 4 sub-functions and is, therefore, a member of the Type E
category. It differs from the devices in the Type F category in that they switch the motors via
a contactor which is connected separately.
According to UL 508 (Type E), a creepage of 1 inch and clearance of 2 inches are required
on the line side for aCombination Motor Controller Type E.

Siemens SIRIUS Series Specifications

General

Brand	Siemens
Model	SIRIUS Series
Category	Controller
Language	English