Product Description
The MMTC HBFT-SLF is a NEMA 1-rated interior tamperproof key switch with an S-Type Large Format (SLF) cylinder, designed for flush mounting in a standard single gang back box in commercial and institutional interior access-control applications. The S-Type Large Format cylinder integrates with facility-wide large-format master key programs, making this switch suitable for hospitals, universities, government buildings, and corporate campuses where hierarchical key control is required. The tamperproof construction and stainless steel faceplate resist unauthorized actuation while maintaining a clean, professional appearance. The switch provides two-position SPDT momentary center-return open-close operation with no stop button, at 15A for gate and door operator compatibility.
Key Features
- Tamperproof design for interior commercial and institutional applications
- S-Type Large Format (SLF) cylinder compatible with commercial master key programs
- SPDT momentary center-return contact - Open and Close positions only
- No Stop button configuration
- Flush mount installation into standard single gang back box
- Stainless steel faceplate approximately 4-1/2" H x 2-3/4" W
- NEMA 1 rated for interior dry locations
- Two-position (Open/Close) operation only
Compatibility Guide
- Single gang back box (standard 1-gang electrical box)
- Compatible with SLF (S-Type Large Format) master key systems
- Works with commercial door operators and gate operators accepting SPDT momentary input
- Compatible with MMTC control boards and other standard gate/door control panels accepting open-close key switch signals
Professional Specs
| Feature | Specification |
|---|
| Model | HBFT-SLF |
| Item Type | Key Switch |
| Contact Configuration | SPDT momentary center-return (Open-Close only, no Stop position) |
| Enclosure Rating | NEMA 1 (interior use only) |
| Materials | Stainless steel faceplate; commercial-grade key cylinder housing |
| Dimensions | Faceplate approximately 4-1/2" H x 2-3/4" W; single gang back box depth |
| Mounting | Flush mount, single gang back box |
| Alternate Part Numbers | HBFT SLF, HBFTSFL, MMTC-HBFT-SLF |
Frequently Asked Questions
Q: Does the HBFT-SLF include a Stop button?
A: No. The HBFT-SLF is a two-position Open-Close key switch only. It does not include a Stop button or a Stop position. If you require a three-function Open-Stop-Close key switch, you would need a different MMTC model.
Q: What does SLF mean in the model number?
A: SLF stands for S-Type Large Format cylinder. This is a commercial and institutional cylinder format commonly used in master key programs, allowing facilities managers to include the key switch in a building-wide keying system.
Q: Can the HBFT-SLF be used outdoors?
A: No. The HBFT-SLF carries a NEMA 1 rating, which means it is designed for interior use only in dry, non-hazardous locations. For outdoor or weatherproof installations, a NEMA 3R or higher rated key switch would be required.
Q: How is the HBFT-SLF mounted?
A: The HBFT-SLF mounts flush into a standard single gang electrical back box, providing a clean, low-profile installation typical of commercial interior wall-mount applications.
Q: What type of electrical contact does the HBFT-SLF use?
A: The HBFT-SLF uses a SPDT (Single Pole Double Throw) momentary contact with center-return action. When the key is turned to Open or Close, the contacts momentarily make and then spring-return to center when the key is released.
Q: What makes this key switch tamperproof?
A: The tamperproof design typically features a stainless steel faceplate without exposed fasteners or with security fasteners, and a keyed cylinder that prevents unauthorized operation, making it resistant to casual tampering and vandalism in interior commercial settings.
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