11
Ta ble 6. Tem per a t ur e-r ise lim it s for insu lat ed coils in air (IE C 60947-4-1)
Cla ss of in su la t in g m a t er ia l
Tem per at u r e-r ise lim it
(m ea sur ed by r esist a nce va r iat ion)
A
E
B
F
H
85 K
100 K
110 K
135 K
160 K
Ta ble 7. Tem per a t ur e-r ise lim it s for t h e var ious m at eria ls a n d pa rt s (IE C 60947-4-1)
Type of m at eria l
Descript ion of pa r t
Tem per at u r e-r ise
lim it (mea su r ed by
t h erm ocou ple)
Con t a ct pa r t s in a ir (m a in , cont r ol a nd a u xiliar y con t acts):
- copper
u n in ter r upted dut y
eigh t -hou r, in t er m it t en t , or tem pora r y du t y
- silver or silver -fa ced
45 K
65 K
1)
Ba r e con du ctors includin g non -in su la t ed coils
1)
Met allic pa r ts a ct in g as spr in gs .
2)
Met allic pa r ts in cont a ct with insu la t in g m at er ia ls
3)
Ter m in a ls for exter n a l insu lat ed con n ect ions
70 K
1) Lim it ed solely by t h e n ecessit y of n ot ca usin g a n y dam age t o adja cent pa rt s.
2) The r esu lt in g t emper at u re sh a ll n ot r ea ch a va lu e su ch t h a t t h e ela st icit y of t h e m a t er ia l is im pa ired. F or pu r e
copper , t h is im plies a t ot al t emper a t ur e n ot exceedin g +75
℃
.
3) Lim it ed solely by t h e n ecessit y of n ot ca usin g a n y dam age t o insu lat in g m at er ia ls.
Wh en no cu r r en t is pa ssed t o t h e m a in a n d a u xilia r y circu it s a n d open in g a n d closin g oper a t ion s in Ta ble 8 cor r e-
spondin g t o t he in t er m it t en t dut y cla ss a r e per form ed, t h e t empera t u re r ise of t h e coil sh all n ot exceed t he lim it s
a s given in Ta ble 6.
Ta ble 8. Oper a t in g con dit ion (IE C 60947-4-1)
In t er m itt en t dut y
cla ss of t he
con t act or
On e close-open
oper at in g cycle
ever y
In t er va l of tim e du r in g
wh ich t h e supply of t h e
con t r ol coil is m a in t a ined
0.1
0.3
1
3
10
300 s
120 s
30 s
12 s
3s
180 s
72 s
18 s
4.8 s
1.2 s
Th e cla ss of insu lat in g m at er ia l of coils is A or E a n d cont act ors sat isfy t h e r equ ir em en t of Class 10 of Table 8.
Summary of Contents for H100C
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