Overview
Intermatic FF36H commercial countdown timers deliver passive timing control for energy management in commercial and industrial environments. No electricity required—the spring-wound mechanism operates independently, making these ideal for retrofit applications where power-operated controls are impractical. Each unit fits standard wall boxes and includes a brushed metal finish plate meeting NEC requirements.
Key Features
- Spring-wound mechanical timer—operates without external power supply
- 6-hour maximum countdown range with easy twist-turn knob operation
- SPDT (Single-Pole Double-Throw) contact configuration for flexible switching logic
- Automatic circuit break at end of timing cycle; no manual reset required
- Compatible with incandescent, fluorescent, CFL, and LED lighting loads
- Brushed metal commercial-grade finish plate; includes quick-connect teeter-type terminals for field installation
Technical Specifications
- Supply Voltage: 125–277V AC, 50/60 Hz
- Contact Output: SPDT (1 normally open, 1 normally closed)
- Maximum Load: 20 A @ 125V resistive; 10 A @ 250V; 10 A @ 277V (resistive); 7 A @ 125V (tungsten)
- Time Range: 0–6 hours (manually adjustable countdown)
- Mounting: Standard 2½-inch deep wall junction box
- Mechanism: Spring-wound countdown timer with manual twist start
- Terminal Connection: Teeter-type front terminals (up-front wiring)
- Operating Temperature: –40°F to +104°F (–40°C to +40°C)
- Dimensions: 1.75 in W × 1.25 in D × 4.125 in H
- Color/Finish: Silver brushed metal plate with white knob
- Certifications: UL and CSA (US and Canada)
Typical Applications
- Bathroom and hallway exhaust fan auto-shutoff in commercial buildings
- Stairwell and parking lot lighting delay-off control
- HVAC heating and cooling equipment on-time limitation
- Equipment drying and curing cycle timing in manufacturing facilities
- Energy management in retrofit applications where no permanent power supply exists
- Universal replacement for existing worn spring-wound timers in wall boxes
Compatibility & Replacements
Compatible With
- Standard 2½-inch deep wall-mounted junction boxes (single or multi-gang)
- Toggle and decorator-style switch plates (no field modifications required)
- Any load rated for 125–277V AC, 50/60 Hz operation
- Fan motors, incandescent/fluorescent/LED/CFL lighting, heaters, and general industrial loads
Replaces / Drop-In Replacement For
- FF Series 6-hour timers (same mounting footprint and terminal layout)
- Worn or failed spring-wound countdown timers in existing 2½-inch boxes
- Manual timer controls requiring upgrade to automatic shutdown capability
Works With
- Any standard wall switch assembly (single or multi-gang configuration)
- Residential and commercial AC circuits rated 125–277V, 50/60 Hz
- Intermatic FF Series accessory plates and trim rings
- No special software, networking, or control logic required—standalone mechanical operation
