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Cable Termination Unit Type 5941

The Tinsley 5941 CTU is the ideal termination unit for non-repeated submarine cables. It offers a simple method of selecting an open or short circuit condition and a safe means of discharging the cable. The unit is designed to enable the Test Engineer to safely and simply connect other Tinsley test instruments to the system for fault location and electroding.

The Tinsley 5941 CTU also incorporates a Cable Condition Monitor. Any changes in the Submarine Cable electrical characteristics are automatically detected and an alarm is triggered. An output from the alarm is also available for connection to outside devices.

5941TERM
The unit can be connected to the cable via a dedicated cable connected to the fibre optic cable metallic conductor. Alternatively, the fibre optic cable can be routed into the CTU with a direct path through the unit for the optical fibres. Options that can be set at the time of installation enable the unit to be used with a wide range of cable lengths and types.

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Electrical Supply and Protection Specifications

Input Supply Voltage

36 V to 60 V DC

Maximum Supply Current

1.5 A

Open Circuit Output Voltage (Input 48 V)

−100 V

Output Voltage Stability

±1 V (at maximum load & supply variation)

Short Circuit Current


  • Normal Drive: 213 ± 13 mA

  • Hard Drive: 297 ± 35 mA

Alarm Level Range

−333 mA to +333 mA

Alarm Level Stability

±2.5% (with load, supply, and temperature variation)

Alarm Contacts Rating

100 V, 0.5 A DC

Maximum Allowable Cable Power


  • Peak Voltage: 600 V

  • Current: 4 A

Operating Temperature Range

0 ºC to 40 ºC

Surge Arrestor Rating


  • Maximum Surge Current: 20 kA

  • DC Spark Over Voltage: 700 V

  • Impulse Spark Over Voltage: 1400 V
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