Title: Engineering Product Specification Telecom Circuit Protector
Revision: L
Printed on: 7/14/2003
Sheet
7
of
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This bulletin is intended to clearly present comprehensive product data and provide technical information that will help the end user with design
applications. Bussmann reserves the right, without notice, to change design or construction of any products and to discontinue or limit distribution of
any products. Bussmann also reserves the right to change or update, without notice, any technical information contained in this bulletin. Once a
product has been selected, it should be tested by the user in all possible applications.
5.3 Time vs. Current Characteristic
(Measured with a Kepco constant current power supply)
5.3.1 For TCP500mA and TCP1.25A
% of Amp Rating
Opening Time
100%
4 Hours Minimum
250%
1 Second Minimum
250%
4 -10 Seconds Typical
250%
120 Seconds Maximum
300%*
10 Seconds Maximum
*If the device does not open at 250% within 120 seconds, increase current to 300% of amp rating.
Device must open in 10 seconds maximum.
5.3.2 For TCP2A
Current Level
Opening Time
2.2A**
30 minutes minimum
7A
opens before Bussmann MDL-2
25A
opens before Bussmann MDL-2
40A
opens before Bussmann MDL-2
% of A mp Rating
Opening Time
100%
4 Hours M inimum
250%
1 Second M inimum
250%
4 -10 Seconds Typical
250%
120 Seconds M aximum
300%*
10 Seconds M aximum
*If the device does not open at 250% within 120 seconds, increase current to 300% of amp rating.
Device must open in 10 seconds maximum.
** The TCP2A may have a maximum temperature rise of 100
°
C after carrying 2.2A for thirty minutes.
5.4 DC Cold Resistance
(Measured at 10% of rated current)
Catalog Symbol
Resistance (ohms)
Min.
Typ.
Max.
TCP500mA
0.420
0.530
0.640
TCP1.25A
0.107
0.128
0.150
TCP2A
0.050
0.075
0.100
