Siemens 340 - Fused Design

Configuration
4.3 Load feeders - protection against short circuit
SIRIUS 3RM1 motor starter
Manual, 11/2013, A5E0345285095020A/RS-AB/002
61
4.3.3.2
Fused design
Combining 3RM1 motor starters with fuses
DANGER
Hazardous Voltage at the Motor
Can Cause Death, Serious Injury, or Property Damage.
Health hazard from automatic hot restart.
The safety function must be checked after every tripping of the motor starter protector (also
in the case of overload).
After every short circuit in the case of short-circuit protection according to
type of
coordination 1
, a 3RM1 motor starter is defective.
Replace a 3RM1 motor starter including the terminals after a short circuit in the case of
short-circuit protection according to type of coordination 1.
With 3RM11/3RM13 Failsafe motor starters, you must check the safety function in addition
to replacing the unit.
With 3RM11/3RM13 Failsafe motor starters, also check the safety function after a short
circuit in the case of short-circuit protection according to
type of coordination 2
.
The 3RM1 motor starters can be combined with the following fuses for short circuits of 55 kA
according to type of coordination 1:
Table 4- 7 Fuses according to type of coordination 1 for 3RM1 motor starters
Motor starter T
A
= 40 °C
Maximum permitted fuse links for
500 V + 10%
DIAZED operating class gG
Rated current [A]
Order number
Rated current [A]
3RM1.01… 0,5 5SB281 25
3RM1.02… 2,0 5SB281 25
3RM1.07… 7,0 5SB281 25