Class A B ModulesModel GSA-UM

Manufacture: kidde
Product code: GSA-UM

The GSA-UM is Universal Class A/B Modules  ⭐
✅ They are intelligent analog Addressable devices that are part of Kidde’s Signature Series system  ⭐
✅ The actual function of the module is determined by the “personality code” selected by the installer. This is downloaded to the module the Signature loop controller during system configuration. The GSA-UM and GSA-MAB gather analog information the slave devices connected to them and convert this digital signals. Each module’s on-board microprocessor measures and analyzes the signal and decides whether or not to input an alarm.


Consulting hotline: 0944934114
Product information

The GSA-UM is installed to a standard North American 2-gang electrical box, making it ideal for locations where only one module is required. Separate I/O and data loop connections are made to each module. The GSA-UM may be used to connect any one of the following:

• two Class B or one Class A Initiating Device Circuits

• one Class A or B Notification Appliance Circuit

• one Class A or B Circuit for 2-wire Smoke Detectors

• one Form “C” (NO/NC) Dry Output Contact Relay

Standard Features

• 15 modules in one

- Multiple applications including Class A or B device circuit wiring, Class A or B 2-wire smoke detector circuits and delayed latching (retard) for waterflow alarm applications. The installer selects one of up to 15 “personality codes” to be downloaded the loop controller.

• Plug in (UIO) or standard 2-gang mount

- UIO versions allow quick installation where multiple modules are required. The 2-gang mount version is ideal for remote locations that require a single module.

• Automatic device mapping

- Signature modules transmit information to the loop controller regarding their circuit locations with respect to other Signature devices on the wire loop.

• Electronic addressing

- Programmable addresses are downloaded the loop controller, a PC, or the SIGA-PRO Signature Program/Service Tool. There are no switches or dials to set.

• Intelligent device with microprocessor

- All decisions are made at the module to allow lower communication speed with substantially improved control panel response time and less sensitivity to line noise and loop wiring properties; twisted or shielded wire is not required.

• Non-volatile memory

- Permanently stores serial number, type of device, and job number. Automatically updates historic information including hours of operation, last maintenanc e date, number of alarms and troubles, and time and date of last alarm.

• Stand-alone operation

- The module makes decisions and inputs an alarm initiating devices connected to it even if the loop controller’s polling interrogation stops. Function availability dependant upon control panel.

• Ground fault detection by address Detects ground faults right down to the device level.

• High ambient temperature operation

- Install in ambient temperatures up to 120oF (49oC).

• Designed to ISO 9001 standards

- All Signature products are manufactured to strict international quality standards to ensure highest reliability.


- The GSA-UM mounts to North American 2-1/2 inch (64 mm) deep 2-gang boxes and 1-1/2 inch (38 mm) deep 4 inch square boxes with 2-gang covers and GSA-MP mounting plates. The terminals are suited for #12 to #18 AWG (2.5 mm2 to 0.75 mm2) wire size

- Kidde recommends that these modules be installed according to latest recognized edition of national and local fire alarm codes

Class A/B ModulesModel GSA-UM

Module Operating Characteristics

Mode of Operation Personality Code Standby Current Alarm Current EOL Resistor Value
Class B Initiating Device Circuit (IDC) 1, 2, 3, 4 396μA 680μA 47K ohm
Form “C” Dry Contact Relay - Note 1 8 100μA 100μA N/A
Class A Initiating Device Circuit (IDC) 9, 10, 11, 12


365μA 47K ohm

2-Wire Smoke Detectors and

Initiating Devices (IDC)

13, 14, 20, 21 2mA

First - 17mA

Subsequent - 100μA

15K ohm

Class A or B Notification Appliance

Circuit (NAC) - See Note 1

15, 16 223μA 365μA 47K ohm (Class B)

Typical Wiring (GSA-UM)

Modules will accept #18 AWG (0.75mm2), #16 (1.0mm2), #14 AWG (1.50mm2) and #12 AWG (2.50mm2) wire sizes. Note: Sizes #16 AWG(1.0mm2) and #18 AWG (0.75mm2) are preferred for ease of installation. See Signature Loop Controller catalog sheet for detailed wiring requirement specifications

Class A/B ModulesModel GSA-UM


Description Standard Mount Universal A/B Module Plug-in (UIO) Universal A/B Module
Wiring Terminations Suitable for #12 to #18 AWG (2.5 mm² to 0.75mm²
Mounting North American 2½ inch (64 mm) deep 2-gang boxes & 1½inch (38 mm) deep 4 inch square boxes with twogang covers and GSA-MP mounting plates Plugs UIO2R, UIO6R or UIO6 Motherboards
Personality Codes 15 Selectable Codes Available 14 Selectable Codes Available
Address Requirements Uses Two Module Addresses
Operating Current See Operating Characteristics Table
Operating Voltage 15.2 to 19.95 Vdc (19 Vdc nominal)
Construction High Impact Engineering Polymer
Storage and Operating Environment Operating Temperature: 32°F to 120°F (0°C to 49°C) Storage Temperature: -4°F to 140°F (-20°C to 60°C) Humidity: 0 to 93% RH
LED Operation On-board Green LED - Flashes when polled; On-board Red LED - Flashes when in alarm/active
Compatibility Use With: Signature Loop Controller
Agency Listings UL, ULC, MEA, CSFM

Ordering Information

Catalog Number Description Ship Wt. lb (kg)
GSA-UM Universal Class A/B Module (Standard Mount) - UL/ULC Listed 0.5 (0.23)
GSA-MAB Universal Class A/B Module (Plug-in) - UL/ULC Listed 0.18 (0.08)





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