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KDHC Series electric welding machine switch

Mechanical life and electrical durability
1. Upper limit and lower limit of ambient air temperature are +40℃ and -25℃ respectively. Average value within 24 hours does not exceed
+35℃ ;
2. The altitude of installation site does not exceed 2000m;
3. Switch should not be converted when electric welding machine is loaded;
4. When maximum temperature is +40℃ , air relative humidity does not exceed 50%. Higher relative humidity is allowed at a lower
temperature. For example, relative humidity reaches 90% in time of +20℃ . It’s required to adopt special measures on the dew
condensates that occasionally form due to temperature changes.
5. Pollution class and installation category are class 3 and category III respectively.

Product model and meaning

KDHC - □ - □ × □ / □

Layer (section number)
Wiring diagram serial number
Positioning characteristic
Pole number
Conventional free air heating current
Electric welding machine switch

Technical parameters

Model and specification KDHC-20 KDHC-25 KDHC-32 KDHC-40 KDHC-63
Conventional heating current Ith A 20 25 32 40 63
Conventional heating current Ue V 240/440 240/440 240/440 240/440 240/440
Rated operating current Ie
AC-21A A 20 25 32 40 63
Cycling number of operation
No-load 8500 8500 8500 8500 8500
On-load 1500 1500 1500 1500 1500
Total number 10000 10000 10000 10000 10000
Operating frequency time/h 120 120 120 120 120

External dimension and Installation dimension(mm)
1-5（ Thickness of mounting panel）
F
0 G 2-G1 G
1 2
4-G2
E
Φ43
A L max I max
Note: L= size of 1 section N denotes contact system plus section number

External dimension(mm) Installation dimension(mm)
Model and
specification
Lmax Imax A E F G G1 G2
KDHC-20 36+12.5n 38 □ 48±0.31 32±0.16 □ 36±0.31 Φ9.5 Φ3.5 Φ4.5
KDHC-25 49+13.5n 37 □ 64±0.37 36±0.31 □ 48±0.31 Φ9.5 Φ4.5 Φ4.5
KDHC-32 49+13.5n 37 □ 64±0.37 36±0.31 □ 48±0.31 Φ9.5 Φ4.5 Φ4.5
KDHC-40 43+13n 37 □ 64±0.37 36±0.31 □ 48±0.31 Φ9.5 Φ4.5 Φ4.5
KDHC-63 58+18n 45 □ 90±0.2 45±0.2 □ 70±0.2 Φ9.5 Φ4.5 Φ4.5

P 49