Securitron UNL Fail Safe Module, 24VDC, Satin Stainless Steel

Both. The module is offered as a 12D and a 24D model, so you pick the one that matches the DC supply already feeding the UNL or MUNL. The 24D operates on a 24VDC supply. Match the module voltage to your power supply output, not to the reader or controller.

No. The UNL and MUNL need the FSUNL unlatch module added to run fail safe; the module is what allows the fail safe configuration. If your access control scheme calls for the door to release on power loss, order the module along with the UNL, in the voltage that matches your supply (12D or 24D).

No. The FSUNL series is an unlatch module used with a UNL or MUNL installation to provide selectable fail safe or fail secure behavior, with the removal of power initiating a full unlatch or latch cycle depending on the mode selected. It does not generate its own operating power. For the transformer side of the job, the Adams Rite 4605 is a regular transformer that takes 115 VAC and outputs 12/24 VAC with a 40 volt-amp output. The two are complementary items rather than alternatives: the FSUNL sets the fail mode, the 4605 feeds the circuit.

It is a separate installation accessory, not a strike. The module mounts as part of a UNL or MUNL installation and controls the unlatch or latch cycle at power loss. You still need the UNL or MUNL hardware itself.

No. The unlatch module only sets fail safe or fail secure behavior on a UNL or MUNL. For REX switching on an exit device, look at Command Access field kits instead: the CRSREXKIT-ED for Cal Royal 22/98 and Sargent 80 Series with an SPDT switch, or the CYREXKIT-ED for Corbin 5000 and Yale 7000 devices. For mortise locks there is the REX-KIT-ML.

The FSUNL unlatch module is built specifically to give a UNL or MUNL installation selectable fail safe or fail secure behavior, initiating a full unlatch or latch cycle when power is removed. If the requirement is distributing switched outputs to several devices, the Locknetics RDB4 is a relay distribution board with four outputs, supplied as a board only. That is a control-distribution part rather than a fail-mode selector, so it does not replace the FSUNL on a UNL or MUNL opening.

No, they solve different problems. Request-to-exit kits are field installable switch kits added to exit devices or mortise locks - for example the Command Access CRSREXKIT-ED for Cal Royal 22/98 and Sargent 80 Series exit devices with an SPDT switch, or the REX-KIT-ML for ML1-Series mortise locks. Those signal that someone is leaving. The FSUNL module instead sets how a UNL or MUNL installation behaves when power is removed, running a full unlatch or latch cycle according to the mode selected. A REX kit cannot provide that fail safe configuration.

The FSUNL module itself does not include power. For a transformer feed, the Adams Rite 4605 steps 115 VAC down to 12/24 VAC with a 40 volt-amp output. Note that the unlatch module is specified on a DC supply (24VDC for the 24D), so size and rectify accordingly for the DC side of your panel.

They sit at different points in the install. The FSUNL is an electrical module that gives a UNL or MUNL selectable fail safe or fail secure operation, with power removal triggering a full unlatch or latch cycle, and it is UL listed hardware offered in 12D and 24D models. The Securitron SAM Surface Mount Kit Accessories and the SWB SAM Wood Bracket accessories are mechanical mounting items for SAM installations, and the SB-MXD is an exit delay sex bolt. None of those mechanical parts affect fail mode, so they do not substitute for the FSUNL.

The FSUNL unlatch module is a commercial Grade 1 installation accessory whose job is to set fail safe or fail secure behavior on a UNL or MUNL installation, independent of the door material. Mounting on a glass door is handled separately by the Securitron Glass Door Accessories line, listed as Grade 2 in the Glass Door Series. If the opening is all-glass, plan on the glass door mounting hardware for the physical attachment and keep the FSUNL for the fail-mode control.