Application planning
4.3 Supply options (main circuit)
SIRIUS 3RA6 compact starter
38
System Manual, 09/2014, NEB560060102000/RS-AA/006
4.3.4
Infeed in accordance with UL 508 (Type E)
Function in accordance with UL 508 and CSA 22.2
According to UL 508 and CSA 22.2, a motor feeder as Type E is required to fulfill 4 sub-
functions:
Table 4- 7
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- 8
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.
Required creepages and clearances
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.
