The Optimum OP-SBST is a captive-tappet 24-hour timeswitch for daily scheduling of heating, hot water and lighting. It mounts directly over a single pattress box, surface or in-wall. Each tappet covers 15 minutes, so you can set the same daily routine to quarter-hour accuracy.
The dial drives volt-free changeover contacts, so it can switch a separate circuit rather than carrying the load itself. That is the usual arrangement for immersion heaters, heating controls and lighting circuits.
Key features
- 24 hour synchronous time switch
- 15 minute tappet intervals
- Captive tappets, they won't drop out when you set them
- Volt-free changeover switching
- Designed to mount directly over a single pattress
- Timed / OFF / constant selection
Technical specification
| Switching capacity |
16 A resistive, 8 A inductive |
| Supply voltage |
220 to 240 V AC, 50 Hz |
| Contacts |
volt-free changeover |
| Programme |
24 hour, 15 minute tappet intervals |
| Tappets |
Captive |
| Modes |
Timed / OFF / constant |
| Mounting |
standard single pattress (socket box), surface or flush |
Installation notes
Installation should be carried out by a qualified electrician in accordance with I.S. 10101.
Need a different schedule at weekends? See the 7-day version, the OP-SBSW.
Frequently Asked Questions
Q: Where can I buy a 24 hour socket box timer in Ireland?
A: The Optimum OP-SBST 24 hour socket box timer is available from Shamrock Electrical at shamrockelectrical.ie, with free delivery to every county in the Republic of Ireland from the first euro. You can also order for collection from our shop in Greenogue Business Park, Rathcoole, Co. Dublin, usually ready in 2 to 4 days.
Q: What is the difference between this and the 7 day version?
A: The OP-SBST runs the same programme every day with 15 minute tappet intervals. The OP-SBSW is a 7 day dial with 2 hour intervals, so you can set different times for different days but with coarser resolution. Choose 24 hour for fine daily control, 7 day if weekends differ.
Q: Do I need an electrician to install it?
A: Yes. It wires into a fixed circuit and mounts over a standard pattress box, so it should be installed by a registered electrician in accordance with I.S. 10101.
Q: What does volt-free changeover mean?
A: The timer's contacts switch a separate circuit rather than carrying the load themselves. It is the standard arrangement for immersion heaters and heating controls, and it is what lets one timer control a much heavier load safely.
Q: Will the tappets fall out?
A: No. They are captive tappets, so they stay in the dial when you set them rather than dropping out like older designs.
Q: Do you deliver across Ireland?
A: Yes. We deliver to every county in the Republic of Ireland, and you can also order for collection from our Rathcoole shop, usually ready in 2 to 4 days.
Every order ships with free delivery from the very first euro, with no minimum spend and no threshold to reach. New customers take 10 percent off a first order. Trade pricing is not shown online, so if you are buying for a job or a contract, call us on 01 401 9907 or email sales@shamrockelectrical.ie for your rate. We are an Irish owned electrical supplier based in Greenogue Business Park, Rathcoole, just off the N7 and well positioned for the M50.
