The TRT-400 A is a speaker connection module with integrated volume control, designed for use in EN 54-17 certified electroacoustic emergency warning and voice alarm systems (ENS/SAA). Unlike isolators, it has no disconnection function and must always be placed between two isolators (such as TRC-800 A or TRT-200 A).

The module supports two usage scenarios: It allows for individual volume adjustment of a general background music feed, or it can be used to inject a separate 100V audio program to the connected loudspeaker. In both cases, the volume control is automatically bypassed during emergency announcements, ensuring full-volume playback.

Powered via the Ringbus and controlled by the TRC-800 A, the TRT-400 A also monitors its connections for faults such as short circuits, open circuits, and ground faults.

Technical Specifications (English):

Model:

• TRT-400 A

Power Supply (via TRC-800 A):

• 19 – 30 V DC (Nominal 30 V DC)
• Idle current: 100 µA
• Max. Power Consumption: 20 mW

Control Signal:

• 20 kHz / 7.5 Vrms

Switching Times:

• Fade-in: 0.3 s
• Fade-out: 1.0 s

Wiring:

• 2-wire system, max. 2.5 mm²
• Max. loop length: 1,000 m
• Max. cable diameter: 13 mm

T-Branch (End-of-Line):

• Max. 50 W
• EoL resistor: 47 kOhm, 0.25 W or higher

Speaker Type:

• Not specified (designed for 100V systems with volume control)

LOOP Fault Detection:

• Short circuit
• Wire-to-wire
• Open circuit
• Ground fault

Mounting:

• Surface-mounted near speaker

Connections:

• Loop Input: L+, L−, GND (0.8–2.5 mm²)
• Loop Output: L+, L−, GND (0.8–2.5 mm²)
• Speaker: L+, L−, GND (0.8–2.5 mm²)
• LED: L+, L− (0.8–2.5 mm²)

Housing / Protection:

• ABS with transparent cover
• IP21C

Dimensions (W x H x D):

• 110 x 130 x 55 mm

Weight:

• 160 g

Certification:

• EN 54-17:2005
• Certificate: 0560-CPR-142190002

Special Features:

• 60 W volume control
• Two modes: Volume adjustment or dedicated 100V feed
• Auto-bypass during alarms
• Integrated line monitoring and fault detection