Wheelock® Series MT Multitone Horns and Horn-Strobes
Versatile, Compliant, and Field-Configurable Notification Devices
The Wheelock® Series MT Multitone Horns and Horn-Strobes from Kidde Fire Systems deliver flexibility with a choice of eight internationally recognized alert tones. Compatible with the AEGIS™-PHX, ARIES™-SLX and ARIES™-MLX suppression control units, these devices provide a unified audible and visual signaling solution for a wide range of commercial and industrial environments.
Each model combines superior sound penetration, field-selectable output levels, and multi-candela strobes to ensure clear, consistent alerts that meet or exceed NFPA, ANSI, and ADA standards.
Key Advantages
- Eight Selectable Alert Tones
Choose from Horn, Bell, March Time Horn, Code-3 Tone, Code-3 Horn, Slow Whoop, Siren, or Hi/Lo Tone. - Dual Output Levels
Standard and High dBA settings adapt to ambient noise conditions. - Multi-Candela Flexibility
Field-selectable 15/30/75/110 cd intensity options on indoor models. - Rugged Construction
Durable thermoplastic housing with Lexan® lens for impact resistance and optical clarity.
- Weatherproof Options
Outdoor-rated MTWP-2475W models deliver 180 cd at 77 °F (25 °C) and 75 cd at –31 °F (–35 °C). - Easy Wiring and Setup
Polarized IN/OUT terminals accept two #12–#18 AWG wires; all tone and candela settings adjustable via DIP switch. - Synchronized Strobes
Maintain precise flash timing across multiple devices using Kidde Fire Systems DSM Sync Modules.
Applications
The Wheelock MT Series is ideal for:
- Fire alarm and emergency communication systems in commercial or institutional buildings
- Manufacturing and warehouse facilities requiring scalable, high-output notification
- Outdoor or marine applications requiring weatherproof signaling (MTWP models)
- Environments needing FIRE or AGENT-marked appliances for suppression-system integration
System Architecture
Construction & Design
Housing: Flame-retardant thermoplastic enclosure, textured red finish
Lens: Rugged Lexan® or equivalent, designed for long-term clarity
Mounting Options: Flush or surface; no trim plate required
Voltage Compatibility: 12 VDC or 24 VDC filtered / FWR input
Flash Rate: 1 Hz (1 flash per second) over regulated voltage range
Synchronization: Fully compatible with AEGIS™, ARIES®, and DSM Sync Modules
Technical Specifications
| SPECIFICATION | DETAILS |
|---|---|
| Operating Voltage | 12 VDC / 24 VDC (Filtered or FWR) |
| Sound Output (Horn Setting) | 92 dBA High / 87 dBA Standard @ 10 ft |
| Flash Intensity (Wall Mount) | 15, 30, 75, 110 cd (Field Selectable) |
| Flash Intensity (Weatherproof) | 180 cd @ 77 °F / 75 cd @ –31 °F |
| Temperature Range | Indoor 32–120 °F (0–49 °C); Outdoor –31–150 °F (–35–66 °C) |
| Relative Humidity | Up to 93 % ± 2 % |
| Current Draw | 0.04 – 0.18 A (dep. on mode and voltage) |
| Mounting Options | Surface / Flush / Weatherproof Backbox |
| Compliance | ADA, NFPA 72, ANSI 117.1, UFC, UL 1971 / 464 / 1638 |
| Approvals | UL, FM, CSFM |
Compliance & Certifications
- UL 1971, UL 1638, UL 464
- FM Approved (MT-12/24-R and MTWP-2475W-FR)
- CSFM Listed
- Meets ADA and NFPA 72 Requirements
Resources
Data Sheet: Wheelock MT Series Multitone Horns and Horn-Strobes (K-75-001)
Kidde Fire Systems Capabilities Brochure (BR101_2023)
Resource links coming soon!
Eight Tones. Endless Reliability.
The Wheelock® MT Series delivers clarity, compliance, and configuration flexibility — ensuring every alert is heard and seen when it matters most. With rugged construction, selectable tone control, and synchronized visual output, these devices represent the standard for versatile, high-performance notification.
