Siemens MSI-20B (part number 500-893081) is a double-action, intelligent addressable manual fire alarm box for Siemens FireFinder XLS and MXL fire alarm control panels. A built-in microcomputer chip gives two-way communication with the panel and stores the device identification and operating status.
The housing is durable molded polycarbonate with a matte red finish and raised white lettering. The user first pushes in the upper lever, then pulls down the lower lever, which locks in place to show that the station has been activated. It stays locked until the hinged cover is opened with an Allen key and closed again.
Specifications
| Model |
MSI-20B |
| Part number |
500-893081 |
| Action |
Double action (push in, then pull down) |
| Panels |
FireFinder XLS, MXL |
| Wiring |
Two-wire addressable circuit, 18 to 14 AWG |
| Current draw |
1 mA |
| Addressing |
Electronic, via DPU or FPI-32 |
| Mounting |
Surface (SB-5R backbox) or semi-flush |
| Shipping weight |
2.5 lb (1.13 kg) |
Features
- Shock and vibration resistant design
- Pull-down lever remains down until reset with an Allen key
- Electronic address programming, no mechanical address switches
- Screw terminals for the addressable circuit
- Works on the same circuit as Model IL and ID-60 series detectors, TRI-series interfaces and CZM-series modules
- UL certified; USCG, FM, CSFM and New York City Fire Department approved
Related models
- MSI-10B (500-893080): single-action version
- SB-5R (310-019860): surface mounting box
- LTP (500-620490): reset tool package with two tools
Documents
FAQ
Which control panels does the MSI-20B work with?
Siemens lists the MSI-20B for the FireFinder XLS and MXL fire alarm control panels. The installation sheet also covers the IXL panel (with ICON-1) and the XL3 panel.
How is the MSI-20B reset after activation?
The pull-down lever stays down and locked until the station is reset. To reset it, open the hinged housing cover with an Allen key, then close and lock the cover.
How do I set the device address?
The address is set electronically with the Model DPU Device Programming Unit or the FPI-32 Programmer/Tester, through an opening in the cover. There are no jumpers, DIP switches or rotary dials.
How is the MSI-20B mounted and wired?
Surface mount it to a Model SB-5R backbox, or flush mount it to a user-supplied single-gang switchbox. It runs on two wires; Siemens recommends 18 AWG minimum and 14 AWG maximum.
