SD505-6RB 6″ Relay Base

$225.00

Specifications

The SD505-6RB is a 6″ addressable relay base for Silent Knight SD Series detectors, delivering an integrated Form C relay for direct control of elevator recall, door closure, and other auxiliary functions.

Model: SD505-6RB 6″ Relay Base
Brand: Silent Knight
Relay Type: Form C (built-in)
Contact Configuration: NO and NC available
Typical Loads: Elevator recall, door closers, HVAC control
Diameter: 6 inches
Detector Compatibility: Silent Knight SD Series heads
Panel Compatibility: Silent Knight addressable FACPs
Mounting: Standard ceiling-mount electrical box
Wiring: Relay contacts wired to the controlled auxiliary device
Addressing: Stored in base
Material: Flame-retardant thermoplastic housing

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Description
FAQs

SD505-6RB 6″ Relay Base

The SD505-6RB 6″ Relay Base is a Silent Knight plug-in detector base fitted with a built-in Form C relay — the kind of integrated auxiliary switching capability that’s especially valuable for elevator recall, door-closure release, and HVAC damper actuation. Because the relay lives in the base itself, integrators save panel-side relay module space and reduce wire runs between the sensor and the controlled device. The SD505-6RB hosts standard SD Series detector heads and is sized at 6″ to match the rest of the SD505 base family, ensuring visual and mechanical consistency across a building’s detection footprint.

Features

Built-in Form C relay (NO/NC contacts available at the base)
Ideal for elevator recall and door-closure control applications
6″ form factor matching the rest of the SD505 base family
Plug-in detector head for clean service and replacement
Reduces reliance on panel-mounted relay modules
Shortens wire runs between sensor and controlled auxiliary device
Compatible with Silent Knight SD Series addressable detectors

Benefits

Dropping the relay function down into the base itself is a smart design choice for integrators building out elevator lobbies and cross-corridor smoke assemblies, because the auxiliary trip logic lives steps away from the detector instead of panel-rooms away. That’s faster to commission, easier to troubleshoot, and easier to change in the field if mechanical coordination requirements shift. The SD505-6RB also reduces panel-side relay module counts, which can lower overall hardware spend on a large SD505 deployment. And because every SD505-6RB is a plug-in base, service teams swap heads for cleaning or replacement without touching relay wiring a small but genuine labor saving.

Why Choose QuickShipFire?

Matched-pair sourcing of SD505-6RB bases with compatible SD505 detector heads
Single-contact ordering for relay bases across multiple project phases
Help wiring Form C contacts for elevator recall scenarios per Silent Knight guidance
Dedicated assistance for refurb projects swapping old panel relays for in-base relays
Reliable stock levels for time-critical elevator-commissioning schedules

FAQs

1. Can the SD505-6RB directly drive an elevator recall contactor?

It drives the low-voltage input of elevator recall logic in most implementations; direct contactor control depends on load ratings and should be reviewed against Silent Knight documentation and local code.

2. How does the Form C relay differ from an isolation or sounder base?

Form C means the base can open or close a circuit on alarm, it's a switching function, distinct from isolation (short-fault protection) and sounder (audible output) bases.

3. Is the relay supervised by the control panel?

Relay status reporting depends on the panel and firmware; the SD505-6RB is addressable, so alarm-state signaling is tied to its programmed loop address.

4. Can multiple SD505-6RBs be programmed for simultaneous actuation?

Yes, a properly configured Silent Knight panel can fire multiple SD505-6RBs on an alarm condition, which is common for multi-elevator or multi-door releases.

5. Will pulling the detector head disable the relay?

Removing the head places the base in a trouble condition; relay behavior on head removal depends on panel configuration and should be verified during commissioning.

6. Is the SD505-6RB a one-for-one swap for a standard SD505 detector base?

Mechanically yes — it fits the same 6" mounting footprint but the wiring at the base changes to include the relay contacts, so install drawings must be updated.

7. Does the SD505-6RB replace the need for a dedicated addressable relay module?

For single-point auxiliary control at a specific detector, yes - it often eliminates the need for a separate panel-side relay module at that location.