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Protection and safety
Telecoms & computer line protection
OVR KT & KE Series

OVR KT & KE Series - Technical specification
Electrical specification OVR KT1 OVR KT1/PTC OVR K10T1 OVR K10T1/PTC
ABB order code 7TCA085400R0305 7TCA085400R0306 7TCA085400R0307 7TCA085400R0410 5
Maximum working – line to line 296 V 296 V 296 V 296 V
voltage Uc (1)
– line to earth 296 V 296 V 296 V 296 V
Current rating (signal) 300 mA 145 mA 300 mA 145 mA
In-line resistance (per line ±10%) 4.4 Ω
Bandwidth (-3 dB 50 Ω system) 20 MHz 20 MHz 20 MHz 20 MHz
Transient specification OVR KT1 OVR KT1/PTC OVR K10T1 OVR K10T1/PTC
Let-through voltage (all conductors) Up
(2)
C2 test 4 kV 1.2/50 μs, – line to line 395 V 395 V 395 V 395 V
2 kA 8/20 μs to BS – line to earth 395 V 395 V 395 V 395 V
EN/EN/IEC 61643-21
C1 test 1 kV, 1.2/50 μs, – line to line 390 V 390 V 390 V 390 V
0.5 kA 8/20 μs to BS – line to earth 390 V 390 V 390 V 390 V
EN/EN/IEC 61643-21
B2 test 4 kV 10/700 μs – line to line 298 V 298 V 298 V 298 V
to BS EN/EN/IEC – line to earth 298 V 298 V 298 V 298 V
61643-21
(3)
5 kV, 10/700 μs – line to line 300 V 300 V 300 V 27 V
– line to earth 300 V 300 V 300 V 80 V
Maximum surge current (4)
D1 test 10/350 μs to – line to line 1 kA
BS EN/EN/IEC – line to earth 2 kA
61643-21
8/20 μs to ITU-T – line to line 5 kA
K.45:2003, IEEE – line to earth 10 kA
C62.41.2:2002
Power Faults specification OVR KT1 OVR KT1/PTC OVR K10T1 OVR K10T1/PTC
Power/Line Cross and Power Induction - tests to: ITU-T (formerly CCITT) K.20, K.21 and
K.45, Telcordia GR-1089-CORE, Issue 2:2002, UL 60950/IEC 950
Power/line cross – 110/230 Vac – 110/230 Vac
(15 min) (15 min)
Power induction – 600 V, 1 A (0.2 sec) – 600 V, 1 A
Mechanical specification OVR KT1, OVR KT1/PTC OVR K10T1, OVR K10T1/PTC OVR KE10
Temperature range -40 to +80 °C –
Connection type To LSA-PLUS disconnection modules (BT part number 237A) –
Earth connection Via OVR KE10 earth bar Via integral earth clip/external M4 bush –
Material FR Polymer UL-94 V-0 Stainless Steel
Weight – Unit 0.01 kg 0.10 kg 0.01 kg
– Packaged 0.12 kg (per 10) 0.12 kg 0.10 kg (per 10)
Dimensions See diagram below

22 mm
110 mm
40 mm
(1) Maximum working voltage (DC or 40 mm
AC peak) at 10 μA for OVR KT1, OVR KT1/ 59 mm 59 mm 20 mm
PTC, OVR K10T1, OVR K10T1/PTC
(2) The maximum transient voltage let-through of the
Depth: 21 mm
protector throughout the test (±10%), line to line & 9.5 mm 110 mm 22 mm
line to earth, both polarities. Response time < 10 ns
(3) Test to IEC 61000-4-5:2006, ITU-T (formerly
CCITT) K.20, K.21 and K.45,Telcordia
GR-1089-CORE, Issue 2:2002, ANSI TIA/EIA/
IS-968-A:2002 (formerly FCC Part 68)
(4) The installation and connections external to the
protector may limit the capability of the protector