SPK-A24 alarm system line equipment cross connect protection device


The protective device SPK-A12 is intended for protection of equipment connected to the alarm detection circuits, communication lines and secondary power supply lines of alarm systems against surge overvoltage (lightning and electrostatic discharges, etc.) within lightning protection zones 1 to 2 (in accordance with IEC 61312-1).

SPK-A24 is designed in the form of a single-pair plug to be inserted in cross-connect equipment – KRONE’s normally-closed  punch-down blocks (Krone LSA-PLUS system), placed in telecommunication enclosure.

Protected equipment: security detectors (SD), fire alarm control panels (FACP), alarm circuit network controllers (ACNC), etc.

→ Technical specification
→ Overall dimensions
→ Installation

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Technical specifications:

Description Значение
Number of protected pairs 1
Nominal operating voltage UN 24 V DC
Max. continuous operating voltage UС 30 V DC
Nominal operating current IN 100 mА
C2 Nominal discharge current (8/20 μs) In Line-to-line / line-to-ground 5 / 5 kА
C2 Max. discharge current (8/20) Imax 10 kА
С2 Protection voltage level UP at In Line-to-line / line-to-ground 65 / 54 V
Series impedance per line 4,7 Ohm
Data transmission rate, maximum 1 Мбит / s
Operating temperature range – 55°С ÷ +50°С
Overall dimensions 55 х 9 х 15 mm
Gross weight 5 g
Test category per IEC 61643-21 C2

Overall dimensions:

Installation of SPK-A24 in punch-down block:

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