This kind of Resistance-reduce-agent is composed of many ingredients, including electrolyte, curing agent, lubricant, electro-conductive cement and stuffing materials. As one excellent electric conductor, it is used between grounding part and earth. On the one hand, it can be closely connected to metal grounding to form enough current surface; on the other hand, it can infiltrate into soil near it to lower resistance and form one low resistance district around grounding parts.
11.Over Pressure Thunder Protection Device for Signal of Information Network
■ QPRS series D type connecting interface surge protection device
It is suitable to the transmitting signal equipment of D type connecting interface type; the type of transmitting connecting interface includes RS485, RS422 and RS232 etc, which is applicable for the industrial automatic system especially for preventing the damage caused because the hoist of electric potential or the over-load of circuit induction.
Type
QPRS232-25
QPRS232-15
QPRS232-9
QPRS485-9
Order No.
5220
5221
5222
5223
Frequency
20KHz
20KHz
20KHz
20KHz
Tie-in (D-Sub)
25 pin
15 pin
9 pin
9 pin
Protected core line
2，3，4，5，6，7，8，20
2，3，4，5
2，3，4，5
4，5，8，9，6(power)
Zero Potential
7
5
5
3
Grade of Protection Voltage
30V
30V
30V
18V
Max. Discharge Current of Every Core (8/20 μ s)
180A
180A
180A
120A
■ QPL series connection type signal surge protection device
It is suitable for three-grade protection of communications system, computer system and automatic control loop system (like RS232, RS422 and RS485) with many good characters such as large discharge current, low outputting residual voltage, long using life and convenient installation etc.
Type 2 line
QPL-6
QPL-12
QPL-24
QPL-48
QPL-120
Order No.
5240
5241
5242
5243
5244
Rating Working Voltage
Un
6V
12V
24V
48V
120V
Rating Working Current
ln
300mA
300mA
300mA
300mA
300mA
Static Threshold Voltage
(100V/s)
9V
18V
36V
75V
200V
Dynamic Voltage
(1KV/μs)
≤12V
≤22V
≤55V
≤120V
≤300V
Rating Discharge Current
(8/20μs)
10KA
10KA
10KA
10KA
10KA
Frequency Width (inserting loss ≤ -0.4dB)
≤2MHz
≤2MHz
≤2MHz
≤2MHz
≤2MHz
Material
Pale Automatic Nonflammable Plastic (UL94-Vo)
External Dimension
17.5×90×17mm
Lead Fixation (lead section)
Bolt Fixation ( ≤ 4mm2)
Function Characteristic
Application
three-grade protection; it will intermit if product aging; crust is anti-flame; mounting rail installation
simulation quantity, digital quantity, control signal
Type Extension
the corresponding type of working current ln ＝ 2A is QPL-A
