The TBC SUL 180A Mechanical Time Switch is a compact, DIN rail-mounted 24-hour timer designed to automate the switching of electrical circuits according to user-defined daily schedules. Engineered for straightforward installation and dependable long-term operation, it eliminates the need for complex digital programming while delivering consistent switching performance.
Built with a flame retardant thermoplastic housing and a transparent protective cover, the SUL 180A is suited for integration into distribution boards and control panels across residential, commercial, and light industrial environments. Its mechanical operating system provides inherent reliability, with a manual override function allowing immediate ON/AUTO/OFF control when required.
With a minimum switching interval of 15 minutes and a rated current of 16A at 250V AC, the SUL 180A is a practical and cost-effective solution for facilities managers, electrical contractors, and panel builders seeking dependable time-based circuit automation.
The TBC SUL 180A Mechanical Time Switch is constructed around a proven mechanical cam-and-segment timing mechanism that operates on a 24-hour cycle. The user sets ON and OFF periods by positioning the tripping segments on the timer dial, providing a clear and intuitive visual representation of the programmed schedule. This approach removes the complexity associated with digital timers and reduces the risk of programming errors during commissioning or schedule changes.
The unit is housed in a flame retardant thermoplastic enclosure finished in white, with a transparent cover that permits visual inspection of the current programme without disturbing the installation. At just 17.5 mm wide, the SUL 180A occupies a single module width on a 35 mm DIN rail, making it highly space-efficient for use in compact distribution boards and industrial control panels.
Designed to operate across an ambient temperature range of -10°C to +50°C and a relative humidity of up to 95%, the SUL 180A delivers consistent performance in the varied environmental conditions typical of commercial and light industrial premises. Its single changeover contact configuration provides flexibility for both normally open and normally closed circuit control applications.
The SUL 180A employs a mechanical rotary cam mechanism driven by a synchronous motor operating on a 220–240V AC, 50–60 Hz supply. Switching is achieved via a single changeover contact rated at 16(4)A 250V AC, where the 16A value represents the resistive load rating and the 4A value represents the inductive load rating. The mechanical reserve operation feature ensures that the timer continues to track time and maintain its programme in the event of a brief power interruption, without requiring a battery.
The manual override lever provides three positions — ON, AUTO, and OFF — enabling the operator to bypass the automatic programme for immediate manual control. The minimum switching interval of 15 minutes per segment ensures reliable contact actuation and prevents excessively short switching cycles that could cause contact wear or load instability.
| Product Type | Mechanical Time Switch |
|---|---|
| Model | SUL 180A |
| Timer Type | 24-hour mechanical timer |
| Rated Voltage | 220–240V AC |
| Frequency | 50–60 Hz |
| Rated Current | 16(4)A 250V AC |
| Switching Contact | 1 changeover contact |
| Program Cycle | 24 hours |
| Minimum Switching Interval | 15 minutes |
| Manual Override | ON / AUTO / OFF |
| Reserve Operation | Mechanical |
| Mounting Type | 35 mm DIN rail |
| Degree of Protection | IP20 |
| Ambient Operating Temperature | -10°C to +50°C |
| Relative Humidity | ≤95% |
| Housing Material | Flame retardant thermoplastic |
| Colour | White with transparent cover |
| Dimensions (H × W × D) | 90 mm × 17.5 mm × 73 mm |
| Weight | 13gm |
| Installation Environment | Indoor use |
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