Bosch PRA‑EOL End‑of‑Line Device – Reliable Speaker-Line Supervision

Ensure safe and uninterrupted public‑address or voice‑alarm operation with the compact Bosch PRA‑EOL. Designed for use at the end of loudspeaker lines, this device enables continuous end‑of‑line monitoring, detecting faults in the amplifier circuit—such as short circuits or open lines—without the need for additional wiring. It uses a 25.5 kHz low‑level pilot tone (3 VRMS), imperceptible to the human ear, to continuously verify integrity.

Key Benefits:

• Seamless Integration: Compact 60 × 78 × 16 mm housing (just 25 g) fits neatly inside loudspeaker enclosures or standard junction boxes. Easily installed using push‑terminal leads with a built‑in thermal fuse.

• Robust Design: Withstands environments from –25 °C to +50 °C (operational) and features IP30 protection when used with the snap‑in base plate .

• Efficient Monitoring: Consumes less than 100 mW input power, capable of supervising cable runs up to 1 km and up to 80 nF capacitance.

• Versatile Mounting: Flexible design allows board‑style installation within loudspeakers or box‑style mounting in cable junctions, complete with strain relief.

• Complete Kit: Includes one PRA‑EOL unit, connection wiring with thermal fuse, a quick‑start installation guide, and safety instructions.

Ideal for loudspeaker lines in public‑address, voice‑alarm, and commercial audio systems where continuous line supervision and safety compliance are critical.