OP-SBST 24 Hour Socket Box Timer, 16 Amp Volt-Free

Daily scheduling for heating, hot water and lighting

The Optimum OP-SBST is a captive-tappet 24-hour timeswitch that 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 — 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: 220–240 V AC, 50 Hz
• Contacts: volt-free changeover
• Programme: 24 hour, 15 minute tappet intervals
• 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 across Ireland from our base in Rathcoole, Co. Dublin.

Q: How much does the OP-SBST cost?
A: It costs €54.82 including VAT, with free delivery across Ireland.

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 collect from our Rathcoole store.

Supplied by Shamrock Electrical Supplies, Rathcoole, Dublin. Trade enquiries welcome — sales@shamrockelectrical.ie or (01) 401 9907.