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The horn – DB3B UL
English
DC version – Up to 3 stage with or without mon-
itoring (alternative configuration) wiring details
(Type 6)
This alternative configuration must be specified
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when ordering the unit.
This type can be connected either as a three stage
common –ve configuration, or if an optional EOL is
specified if can be configured as a dual stage common
–ve system with monitoring.
4-wire system (Triple stage, Common +ve): Connect
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4 supply wires to the terminals as detailed in the
wiring diagram (1 common +ve wire and 3 -ve wires).
Stage 1 is produced when power is applied across the
common +ve and stage 1 -ve terminals. Stage 2 is
produced when power is applied across the common
+ve and stage 2 -ve terminals. Stage 3 is produced
when power is applied across the common +ve and
stage 3 -ve terminals.
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4-wire system (Dual stage, common –ve with
monitoring): Connect 4 supply wires to the terminals
as detailed in the wiring diagram. Stage 1 is produced
when power is applied across the common -ve and
stage 1 +ve terminals. Stage 2 is produced when
power is applied across the common -ve and stage 2
+ve terminals.
Monitoring functionality is obtained when the supply is
connected across M1 & M2 terminals.
monitored terminals are not polarity dependents
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4.0 Operation
The sounder is available in various AC and DC input
voltage versions.
For AC versions, 120Vac and 240Vac units comply with
regulated supply limits, for all other AC versions, the
nominal operating voltage is stated on the unit label and
the supply voltage tolerance is ±10%.
For 12-48Vdc versions, the absolute input voltage range is
11.0Vdc to 58.0Vdc.
The unit is fitted with a volume control which is
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The horn – DB3B UL TM261 April 2020 www.eaton.com
DC version with voltage free stage activation
wiring details (Type 7)
Connect the positive (+ve) and negative (-ve) supply wires
to the terminals as detailed in the wiring diagram. When
power is applied to the unit, no tone will be produced
initially. Connect wires and remote switches to terminals
R0 to R5 as shown. When the switch connected to R1 is
closed, the stage 1 tone will be produced as selected by
the 5-way DIP switch on the electronics assembly. When
any of the other switches connected to R2 to R5 is closed,
the pre- selected tone for stages 2 to 5 are produced.
See tone table 2 for details of pre-selected tones.
Closing more than one switch at a time will result
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in no tone being produced.
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positioned on the top face of the electronics assembly
PCB. Maximum volume is obtained when this control is
turned fully clockwise. When turned fully anti-clockwise
the unit will emit no sound. For fire alarm use, if the
control is not set to maximum volume, ensure the output
from the horn meets the minimum level required by the
relevant standards.
Warning: Do not attempt to turn the volume control past
its limits of movement as this may cause damage to
the unit.
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