User guide

Model MS-25 Installation and Operation Manual
3-2 53688
3.3 Electrical Specifications
Table 3-1 list the electrical specifications for the MS-25 field wiring as well as a description of
the each individual terminal and their respective electrical rating. For location of the terminals
refer to 3.5. See also Section 4 for installation.
* Regulated for NAC circuits
* Special application when used for auxiliary power circuits.
Table 3-1: Terminal Descriptions
Terminal
Block
Label
Description
Rating
Earth Ground
Fault Impedance
Group Individual Voltage Current Ohms
TB 1 SBUS – SBUS Power 27.4 VDC 100 mA 0Ω
+
A SBUS Communication 3.3 VDC 10 mA 0Ω
B
SLC Out – SLC Terminals 24 VDC 100 mA 0Ω
+
*NAC1 – Notification Appliance Circuit 24 VDC 2.0 Amp 0Ω
+ Auxiliary power 1.0 Amp
*NAC2 – Notification Appliance Circuit 24 VDC 2.0 Amp 0Ω
+ Auxiliary power 1.0 Amp
TROUBLE NO Normally open relay contact 24 VDC 2.5 A, resistive N/A
COM Common terminal
NC Normally closed relay contact
RELAY 1 NO Normally open relay contact 24 VDC 2.5 A, resistive N/A
COM Common terminal
NC Normally closed relay contact
RELAY 2 NO Normally open relay contact 24 VDC 2.5 A, resistive N/A
COM Common terminal
NC Normally closed relay contact
TB 2 TELCO 1 RING Phone Line 1 Telco Ring N/A N/A N/A
TIP Phone Line 1 Telco Tip
PHONE 1 RING Phone Line 1 Phone Ring
TIP Phone Line 1 Phone Tip
TELCO 2 RING Phone Line 2 Telco Ring
TIP Phone Line 2 Telco Tip
PHONE 2 RING Phone Line 2 Phone Ring
TIP Phone Line 2 Phone Tip