4098-9789 Simplex TrueAlarm Sensor Base | Wired Connections
What Is the 4098-9789?
The Simplex 4098-9789 is the standard (plain) mounting base in the TrueAlarm 4098 addressable sensor family. It connects the sensor head to the Signaling Line Circuit (SLC) and provides a secure mechanical mount — nothing more, nothing less. With no integrated relay or sounder, it is the lowest-cost base in the 4098 family.
The 4098-9789 is the correct choice for the majority of detector locations in a typical Simplex building: open-plan offices, corridors, storage rooms, and classrooms where detection only is needed. Over-specifying relay or sounder bases where they are not required adds unnecessary cost to large installations. At $35 each, the 4098-9789 is the go-to standard base for Simplex TrueAlarm projects.
Key Features
- Standard Base: Plain mounting + SLC connection. Correct choice for the majority of non-special detector locations.
- Twist-Lock: Quarter-turn twist-lock sensor head connection no tools required for installation or replacement.
- Protocol: IDNet and MAPNET II Simplex 4100ES, 4010ES, 4007ES, 4008.
- Sensor Family: Accepts all 4098-series TrueAlarm sensor heads: photoelectric, heat, and combination types.
- Mounting: Standard 4-inch octagonal or square electrical box.
- Cost: $35 the lowest-cost base in the Simplex TrueAlarm 4098 family.
Applications – Where This Base Is Used
- Open-plan offices standard smoke detection with no auxiliary output required
- Hotel corridors and guest rooms where notification is handled by separate NAC circuits
- School classrooms standard coverage per NFPA 72 detector spacing
- Storage rooms and non-kitchen mechanical spaces
- Retail floor areas standard addressable smoke detection
Benefits
The 4098-9789 brings value to projects where a straightforward wired-connection base is preferred over a full supervised relay design – especially in retrofits, refresh jobs, or budget-conscious commercial builds. By supporting either a remote LED or an auxiliary relay, it lets integrators tailor each location without changing the base hardware, which reduces SKU sprawl on multi-floor installations. Because addressing lives in the base, technicians can swap sensor heads during cleaning or replacement without revisiting the control panel for reprogramming. Its slim profile and depth-flexible box compatibility make it easier to install in older electrical boxes where space is tight, cutting labor time on upgrade jobs.
Why Source From QuickShipFire?
At $35, the 4098-9789 is the most cost-effective Simplex TrueAlarm base. QuickShipFire ships factory-sealed in original packaging. For quantity orders across a multi-floor project, call (833) 747-7845 to confirm same-day stock depth.
| COMPATIBILITY & SENSOR REFERENCE |
Compatible with Simplex TrueAlarm 4098-series sensor heads. If relay output or sounder output is needed at this location, use 4098-9780 (relay) or 4098-9794 (sounder) instead.
Compatible Sensor Heads
| Sensor Model | Sensor Type | Notes |
| 4098-9601 | TrueAlarm Photoelectric (analog) | Standard office/corridor detection |
| 4098-9602 | TrueAlarm TrueSense Combo | Multi-mode combination detector |
| 4098-9714 | TrueAlarm Photoelectric Sensor | Standard photoelectric sensor |
| 4098-9733 | TrueAlarm Heat Sensor | Heat-only for non-standard environments |
| INSTALLATION & WIRING NOTES |
Standard TrueAlarm base installation — 5 steps.
- Step 1: Mount 4-inch electrical box at detector location.
- Step 2: Run SLC wiring into box and connect SLC+ and SLC– to base terminals.
- Step 3: Secure 4098-9789 base to electrical box.
- Step 4: Install sensor head with quarter-turn clockwise twist-lock.
- Step 5: Initialize at panel, verify address, and test alarm response.
⚠ IMPORTANT : Do not force the sensor head twist. If it does not rotate smoothly, check for misalignment of the mounting pins before applying more force.