Secheron UR46-81S, Instruction Manual

Page: 16 / 68

Technical specifications UR46-81/82S
Document number: SG104148TEN Revision: B01 Issue date: 20.8.2012
Copyright© 2012 Sécheron SA - This document is not contractual and contains information corresponding to the level of technology at the date of release.
B-16
File: b-UR46-8S_tech data_en.fm
B.2 Breaker control
The circuit-breaker can be maintained in the closed position using either a reduced holding
current (E type) or without current (M type).
Note! Sécheron recommends the protection of the closing device coil using an automatic circuit-
breaker with thermal protection, having the following characteristics: a closing pulse duration of
0.5-1 sec, the ability to trigger the circuit-breaker several times consecutively and a holding
current that is limited to 5% of the closing current.
Electric holding: E type
A. Start of the closing pulse: the contacts F + G close.
B. Closing pulse: 0.5 to 1 s.
C. Start of the holding current: the contact G opens.
D. Holding: a R1 resistance limits the holding current to 5% of the closing current.
E. Opening: the contact F opens to provoke the interruption of the holding current.
03602
Magnetic holding: M type
A. Start of the closing pulse: the contacts E close.
B. Closing pulse: 0.5 to 1 s, then the contacts E open.
C. Holding: achieved by the permanent magnet.
D. Opening: the contacts F close to provoke a current pulse of the opposite polarity to the
closing current. The duration of this pulse is 0.5-1 s, then the contacts F opens. The opening
current is 20 % of the closing current.
03604
Important!
A longer closing pulse may burn the coil.
R1: holding resistor S: automatic circuit-breaker
Rp: parallel resistor Rs: serial resistor S: automatic circuit-breaker
–
+
~ 5%
100%
0 0,5 1
t [s]
S
V=
R1
E
F
G
B C
A
D
I
e
I
e
~ 20%
100%
0
0
0,5 1 t
c
t
c
+1
t
c
+0.5
t [s]
D
F E
B
A
C
–
S
V=
+
Rp
Rs