Datasheet
3RV Molded Case Motor Starter Protectors up to 800 A
General data
42
Siemens · 2010
■
Function
Trip units
The 3RV1 molded case motor starter protectors for up to 800 A are available with four different trip units.
1) TU = Trip unit
3RV10 molded case motor starter protectors with trip unit TU 4
Trip classes
The trip classes of thermally delayed trip units are based on the
tripping time (t
A
) at 7.2 times the set current in cold state (ex-
cerpt from IEC 60947-4):
• CLASS 10A: 2 s < t
A
<10s
• CLASS 10: 4 s < t
A
<10s
• CLASS 20: 6 s < t
A
<20s
• CLASS 30: 9 s < t
A
<30s
The molded case motor starter protector must trip within this
time!
With the 3RV1 molded case motor starter protectors (100 A to
630 A) which are equipped with the TU 4 trip unit, all four trip
classes are possible.
Safe switch position
The toggle lever indicates tripping by adopting the "Tripped" po-
sition. To prevent switching onto an existing fault, the lever must
be moved by hand to the 0 position prior to switching on again.
Only then can the molded case motor starter protector be swit-
ched on again.
Type
1)
Tripping method For molded case motor
starter protectors
Function Setting range External overload relay
required for overload protection
TU 1
Purely magnetic 1...12.5A Short-circuit protection Non-adjustable: 13 x I
N
Yes
TU 2
Purely magnetic 20 A, 32 A Short-circuit protection Adjustable: 6 ... 13 x I
N
Yes
TU 3
Electronic
(for starter combi-
nations)
100 ... 800 A Short-circuit protection Adjustable: 1 ... 10 x I
N
Yes
TU 4
Electronic
(for motor protec-
tion)
100 ... 630 A Adjustable: No
Overload protection I
1
= 0.4...1xI
N
Short-circuit protection 6...13xI
N
Protection in the event of rotor
blockage
3...10xI
1
Protection function R
Against rotor lockin
Protection function L
Against overloading of the motor
CLASS
Trip classes of motor according
to IEC 60047-4-1
Choice between:
- input for PTC
1)
temperature sensor
- generic input 1/0
1)
A special input is available for connecting a PTC temperature sensor which can be inserted in the motor to be protected.
Protection function I
For instantaneous short-
circuit protection
Protection function U
Against phase failure or phase
unbalance
Specifying the mode of operation
Always set to CB
MAN/ELT
Always set to MAN
NSB0_01987a