SDC TR Series Regulated DC Pow...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$91.00
$58.70
SDC SDC TR Series - Plug-In DC Power Supply Transformers SDC-TR

SDC TR Series Regulated DC Power Supply Transformers - 12V/24V 1 Amp with Thermal Protection

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Model: TR12

In Stock (leaves warehouse same day if ordered before 3pm ET)

$91.00
$58.70
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SDC TR Series Regulated DC Power Supply Transformers - 12V/24V 1 Amp with Thermal Protection

Professional Plug-In Power Solutions for Access Control Systems

SDC TR Series plug-in power supplies are electrical devices featuring transformers and rectifier circuitry to convert 120VAC line voltage to low voltage DC. Available in regulated 12VDC and 24VDC models, each unit delivers 1 amp of regulated power with thermal overload protection. UL listed Class 2 design ensures safe, reliable operation for commercial access control applications.

Professional Features & Benefits

  • Dual Voltage Options: Available as TR12 (12VDC) and TR24 (24VDC) models, each delivering regulated 1 amp power for flexible system integration.
  • Regulated Power Output: Consistent 1 amp regulated DC power ensures stable operation of connected access control devices and components.
  • Thermal Overload Protection: Built-in thermal protection prevents damage from overload conditions and extends operational life in demanding applications.
  • UL Listed Class 2 Design: UL listed Class 2 certification provides safety compliance and simplified installation requirements for commercial applications.
  • 120VAC Input Compatibility: Standard 120VAC line voltage input works with existing electrical infrastructure without special wiring requirements.
  • Plug-In Convenience: Compact plug-in design allows easy installation and replacement without hardwired connections or electrical modifications.

Technical Specifications

  • Commercial/Residential: Commercial
  • Department: Door Hardware
  • Electronic: Yes
  • PDF:SDC Full Catalog: https://zensupply.com/content/pdf/lcn/CondensedHardwareBrochure
  • Product Category: Electronic Access Controls
  • Product Group: Electronic Access Controls
  • Product Model: TR12, TR24
  • Product Subgroup: Controllers, Power Supplies and Transformers
  • Product Type: Power Supply Plug-In DC
  • Product Voltage: 120V
  • Series: TR Series
  • Subcategory: Power Supply Plug-In DC

Professional Applications

  • Commercial Building Security Systems
  • Electronic Access Control Installations
  • Card Reader and Keypad Power Supply
  • Electric Strike and Lock Power Systems
  • Security Camera and Sensor Networks
  • Intercom and Communication Systems
  • Emergency Access Control Backup Power

Why Choose SDC Quality?

SDC TR Series power supplies deliver professional-grade reliability with UL listed Class 2 certification and thermal overload protection for demanding commercial applications. Regulated 1 amp output ensures consistent performance for access control systems requiring stable DC power. Engineered for dependable operation where reliable power supply performance is essential.

Manufacturer Resources

SDC Full Catalog

Product Specs

Subcategory:
Power Supply Plug-In DC
Series:
TR Series
Product Group:
Electronic Access Controls
Product Subgroup:
Controllers, Power Supplies and Transformers
Commercial/Residential:
Commercial
Product Type:
Power Supply Plug-In DC
Electronic:
Yes
Product Model:
TR12, TR24
Product Voltage:
120V
Product Category:
Electronic Access Controls
Department:
Door Hardware

SDC TR12 – Frequently Asked Questions

1) Should I order the SDC TR12 or the TR24 for my electric strike?
Match the transformer to the voltage the lock or strike calls for. The TR Series comes in two models: TR12 puts out regulated 12VDC, TR24 puts out regulated 24VDC. Both are 1 amp, both plug into a standard 120VAC receptacle. There is no field-selectable jumper between the two, so the model you order is the voltage you get. Check the strike's rating plate first, because a 24V device fed 12V will not pull in and a 12V device fed 24V will burn.
2) Will a 1 amp SDC TR transformer run my electric strike and card reader on the same door?
One amp is the ceiling for everything you hang off it. Add up the continuous draw of the strike plus the reader plus anything else on that circuit, and if the total is under 1 amp at the transformer's voltage you are fine. A single continuous-duty strike and a reader typically fit; a magnetic lock plus reader plus keypad usually does not, and for that you want a larger boxed supply rather than a plug-in unit. The TR delivers regulated output, so the voltage holds steady as the load changes within that 1 amp.
3) Is the SDC TR12 plug-in power supply UL listed?
The TR Series is UL listed as a Class 2 supply. That matters on a commercial job because Class 2 limits the power on the secondary side, so the low voltage run to the lock or reader does not have to be pulled in conduit as a power circuit and can go in as low voltage cable under the local code. Both the 12VDC and 24VDC models carry it.
4) Do I need an electrician to install an SDC TR Series transformer?
No. The TR is a plug-in unit, so it goes into an existing 120VAC receptacle and you land the DC leads on the device. There is no line-voltage hardwiring, no junction box, and no electrical modification to the building. That is the practical difference between this and a boxed access control power supply, which usually gets hardwired and needs a licensed hand on the primary side.
5) What happens to an SDC TR power supply if the circuit gets overloaded?
Thermal overload protection is built into the TR Series. If the connected load pushes the unit past what it can handle, the thermal protection acts before the transformer cooks itself. It is a self-protecting design rather than a fuse you have to carry a spare for, but it is not a licence to exceed the 1 amp rating as a matter of course. Size the load properly and the protection stays a backstop.
6) Is a plug-in transformer like the SDC TR good enough for a commercial access control job, or do I need a boxed power supply?
The TR is built for commercial use and carries UL Class 2 listing, so it holds up on a single-opening job: one card reader, one keypad, one strike, an intercom station, a sensor. Where it stops being the right choice is anything needing more than 1 amp, multiple doors fed from one point, battery backup for a fire or egress requirement, or a supervised enclosure. Those call for a boxed multi-output supply with a battery compartment. Rule of thumb: one device or one door, use the TR; a panel serving several doors, use a larger supply.
7) Does the SDC TR give clean regulated DC, or is it just a wall wart?
Regulated, on both models. The TR uses a transformer with rectifier circuitry and regulation, so the output holds at nominal 12 or 24 volts instead of drifting high at light load the way an unregulated wall transformer does. That matters when you are powering a card reader, keypad, or camera, because unregulated overvoltage at low draw is what kills reader electronics. For a plain electric strike either would work; for anything with a board in it, regulated is what you want.
8) Can I use an SDC TR transformer to power a maglock?
Only for a small one, and only if the numbers work. The TR supplies 1 amp of regulated DC at either 12 or 24 volts. Many magnetic locks draw around half an amp at 12V and less at 24V, so a single mag can fit, but two on a pair of doors generally will not. Also worth knowing: a maglock is fail safe and drops open when power goes, and the TR is a plug-in unit with no battery backup, so if that opening is on an access control system that has to hold through an outage, put the lock on a supply with standby batteries instead.
9) I'm standardizing power supplies across a building's card readers. Can I use the same SDC TR unit on every door?
Yes, as long as every opening runs on the same voltage and each one stays under 1 amp. The TR Series gives you one part number per voltage, TR12 or TR24, so a facility that spec'd all 12V hardware stocks TR12 and nothing else. Where openings are mixed, you carry both, and they are not interchangeable in the field. Buying one model in quantity also means a failed unit gets swapped by unplugging it, with no electrician callout.
10) What can the SDC TR Series actually power besides door locks?
Anything on a low voltage security circuit that fits inside 1 amp at 12 or 24 volts DC: card readers and keypads, electric strikes and electric locks, security cameras and sensors, intercom and communication stations, and access control components generally. The limiting factors are voltage match and total current draw, not the type of device.
How fast can I get the SDC TR12 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the SDC TR12 come with a warranty?
Absolutely. The SDC TR12 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the SDC TR12?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the SDC TR12 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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