Security Brands 55-T24 7 Day Digital Timer 24 VAC/DC
The Security Brands 55-T24 is the 24 VAC/DC member of the 55-T digital timer series. It is used when an access point needs a weekly schedule rather than constant operation. Common field uses include opening a gate during business hours, enabling a keypad during delivery hours, controlling a relay for a mag lock or door strike, or managing a time-of-day input on a compatible control board. Because access-control panels and gate operators commonly provide different voltages, matching the timer voltage is essential. The 55-T24 is not simply a universal timer; it is the model for 24 VAC/DC circuits, while 55-T12 and 55-T110 are separate voltage versions.
Compatible With
- 24 VAC/DC access-control and gate-control circuits requiring timed switching
- Security Brands / AAS systems where a 24 VAC/DC timer is specified
- Gate operators, door controllers, keypads, receivers, relays, locks, and auxiliary devices that support an external timer relay within rating
- Weekly hold-open, business-hour, visitor access, and relay-enable schedules
- Previously referenced as S-T24 in Security Brands timer family listings
- Not interchangeable with 12 VDC or 110 VAC timer versions without confirming voltage and wiring
Features and Specifications
| Manufacturer | Security Brands / American Access Systems |
|---|
| Product Type | 7-day digital quartz timer |
|---|
| Part Number | 55-T24 |
|---|
| Previous Number | S-T24 |
|---|
| Application | Scheduled switching / access control |
|---|
| Input Voltage | 24 VAC/DC |
|---|
| Programs | 8 ON/OFF programs, up to 56 weekly settings |
|---|
| Features | Battery backup, manual override, LED ON/OFF indicator |
|---|
| Dimensions | 2.44 in H x 2.44 in W x 1.30 in D |
|---|
| Notes | Use only where 24 VAC/DC control power is correct |
|---|
Also Known As / Related Part Numbers
- 55-T24
- 55T24
- S-T24
- ST24
- Security Brands 7-Day Timer 24 VAC/DC
- AAS 55-T24
- American Access 55-T24
- 24 volt digital timer
- 7-day digital quartz timer
Technician Note
Power-management and timer parts should be matched by voltage, load requirements, battery type, and enclosure location. Do not guess on voltage or wire a high-voltage timer into a low-voltage circuit.
Before Ordering
- Confirm the manufacturer part number and any old/new part number references.
- Match the product family and application, not just the brand name.
- Check voltage, frequency, activation method, receiver family, or battery type as applicable.
- Review the existing wiring, mounting location, and enclosure before replacing the part.
- For fire access or line-voltage work, confirm local code and use a qualified professional when required.
Professional Advisory
Access-control and power-management parts should be installed in accordance with the gate operator, access controller, local code, and site safety requirements. For high-voltage wiring, fire department access, or unsafe gate movement, use a qualified gate technician or licensed professional where required.
Product Questions and Answers
What voltage does the 55-T24 require?
The 55-T24 requires 24 VAC/DC input power.
Is 55-T24 the same as S-T24?
Security Brands lists 55-T24 as previously S-T24.
What is this timer commonly used for?
It is commonly used for weekly access schedules, hold-open schedules, relay enable periods, and timed gate or door control.
Can this replace a 12 VDC timer?
No. For 12 VDC applications use 55-T12 unless the system has been changed and approved for 24 VAC/DC.
Does it include manual override?
Yes. The timer family includes temporary manual override and LED ON/OFF indication.
