Smoke Detectors with Auxiliary Functions 500 Series
500 Series ⭐
✅ two-wire conventional photoelectric smoke detectors bring together trusted technology and a full line of features that meet the demands of every type of application. The 500 offers sounders in two-wire applications, specifically to meet residential code requirements.
- Kidde is also proud to offer proven technology like CleanMe®, dust compensation, field replaceable optical chambers, and selfdiagnostics. CleanMe® is only available on the 500 2-wire models and will communicate with compatible FACPs when servicing is required.
- 500 Series detectors work on a light-scattering principle. A pulsed infrared light-emitting diode serves as the light source, and a highspeed photo diode as the sensing element. This design has superior protection against nuisance alarms caused by dust, insects, RF interference, and ambient light.
- The proprietary optical chamber is field replaceable. In the event of a confirmed alarm the LED will light continuously. The unit indicates trouble by flashing the LED every second. This meets the NFPA 72 field sensitivity testing requirements.
- Additional diagnostic information is activated by applying a magnet near the detector’s integral reed switch. This initiates a self-diagnostic routine and provides visual indication of sensitivity level, or if service is required. The magnet test causes the LED to blink. The number of blink counts corresponds to a smoke detector sensitivity range.
- Models with a built-in 85dB sounders emit the temporal 3 pattern and can be easily tandemly interconnected using the 405-05 polarity reversal relay. This enables all detectors to sound when the initiating detector sounds and meets the requirement of the International Residential Building Code (IRC).
Standard Features
• Remote maintenance (CleanMe®) reporting and builtin drift compensation reduces false alarms
• Self-diagnostics meets NFPA 72 sensitivity testing requirements without the need for external meters
• Field-replaceable optical chamber makes service fast and simple
• Large SEMS screw terminals accept 12-18 AWG wire
• Small, low profile design blends with any environment
• Optional auxiliary functions include:
• Integral sounder with optional tandem interconnection
• Auxiliary relay Listed for applications such as elevator recall
• Fire system isolated heat integrated with nonlatching single station smoke alarm
• Integral fixed/ROR heat detectors
• Adaptor plate enables replacing 500 Series with legacy 400 Series smoke detectors
Application
500 Series detectors are ideal for both retrofit applications and new installations alike. They are particularly well-suited for installations where detector reliability is essential, but where typical analog/addressable devices may not be appropriate or feasible. With their replaceable optical chambers, these detectors are equally well-suited to dusty environments where detectors require frequent cleaning.
Assembly
Dimensions
Typical Wiring
Specifications
Electrical
| Power Supply | 8.5-33VDC (12/24 V operation) polarity sensitive |
| Maximum ripple pk-pk (6/12/24V) | 10% (Vpk-pk) |
| Typical average standby current | 70 μA |
| Typical alarm current (6/12/24V) | up to 60 mA max if not limited by control panel |
| Auxiliary relay contacts (521NCRXT only | 1.0 A @ 30 VDC; Form C |
| Photoelectric sensitivity | 3.1% + 0.5 - 1.0% |
Environment
| Operating temperature | 32° to 100° F (0° to 37° C) |
| Operating humidity range | 0 to 95% non-condensing |
| RFI immunity | 20 V/m min; 0-1000 MHz |
Physical
| Color | White |
| Field wiring size | 12-18 AWG (16-22 recommended) |
| Heat detector specifications | Rate-of-Rise: 15° F/min and >105° F (8.3° C/min and >40.6° C) Fixed Threshold: 135° F (57.2° C) |
| UL 2-wire compatibility identifiers | S09A, S10A, S11A |
| Sounder output (521NCSXT only) | 85dB @ 10 feet |
| Drift compensation adjustment | 1.0% ft. max |
| Detector head dimensions | 5.5 D x 2" H (14.0 x 5 cm) |
| Mounting dimensions | 5.25" (13.3 cm) diam |
Regulations
| Reset time | 1 second min |
| Listings | |
|
500N Series: 521B, 521BXT: |
UL 268 cUL, CSFM UL 268, CSFM |
Ordering Information
| Model | Description | Compatibility | Alarm Current (mA) | Reverse polarity (mA) |
| 521B | 2-wire, photoelectric, 8.5-33VDC; UL 268, CSFM Listed | S09A/S10A | 5 min. - 60 max. | |
| 521BXT | 2-wire, photoelectric, 8.5-33VDC, fixed temp and rate-of-rise heat; UL 268, CSFM Listed | S09A/S10A | 5 min. - 60 max. | |
| 521NCRXT | 2-wire, photoelectric, 8.5-33VDC, fixed temp and rate-of-rise heat, aux. relay; UL 268, cUL, CSFM Listed | S11A | 15 min. - 60 max. | |
| 521NCSXT | 2-wire, photoelectric, 8.5-33VDC, fixed temp and rate-of-rise heat, temporal 3 sounder; UL 268, cUL, CSFM Listed | S10A | 10 min. - 60 max | 10 |
| Note: Only 500 Series 2-wire smoke detectors are CleanMe compatible | ||||
Accessories
| 405-05 | Polarity reversal module enables sounder interconnection of all 4-wire smoke detectors, when initiating detector sounds all smokes sound |
| SM200-12PKG | Smoke! in a Can® canned smoke for functional testing |
| SM-EXT1 | Smoke! in a Can® extension tube |
| 211-10PKG | Replacement optical chambers (set of 10) |
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