SDC 634 Series 4 Amp Regulated...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$784.00
$510.14
SDC SDC 634 Series - 4 Amp Regulated & Filtered Low Voltage Power Supply SDC-634

SDC 634 Series 4 Amp Regulated & Filtered Low Voltage Power Supply with Dual Voltage Selection

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Model: 634RF
$784.00
$510.14

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

$784.00
$510.14
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SDC 634 Series 4 Amp Regulated & Filtered Low Voltage Power Supply with Dual Voltage Selection

Professional Access Control Power Solution

The SDC 634 Series power supply delivers regulated and filtered 4 amp DC power specifically engineered for electric locks and access control systems. This hybrid design combines switching power supply efficiency with linear power supply inductive load handling capability, featuring field selectable dual voltage operation and Class 2 output rating. Built to address the unique power requirements of access control systems, this unit provides steady, clean filtered low-voltage DC current with comprehensive surge protection.

Professional Features & Benefits

  • High Current Capacity: 4 amp regulated output provides ample power for multi-door applications and inductive loads including electric locks and access control devices.
  • Hybrid Power Design: Combines switching power supply efficiency with linear power supply inductive load handling capability for optimal performance with access control hardware.
  • Field Selectable Dual Voltage: Configurable 12/24 VDC output allows adaptation to various system voltage requirements without separate models.
  • Regulated and Filtered Output: Clean DC power with filtering and voltage regulation protects system components and ensures longevity of connected devices.
  • Fire/Emergency Release Input: Integrated fire alarm interface provides automatic emergency unlock capability for life safety compliance.
  • Isolated Battery Charging Circuit: Built-in battery backup charging with low battery disconnect protects backup power systems.
  • Comprehensive Surge Protection: Input and output surge suppression protects printed circuit boards and connected devices from power transients and voltage spikes.
  • Professional Certifications: UL 294 Access Control System Units, UL 603 Power Supplies for Burglar-Alarm Systems, and ULC-S318 certified for commercial applications.

Technical Specifications

  • Commercial/Residential: Commercial
  • Current: 4A
  • Department: Door Hardware
  • Electronic: Yes
  • Product Category: Electronic Access Controls
  • Product Group: Electronic Access Controls
  • Product Model: 634RF
  • Product Subgroup: Controllers, Power Supplies and Transformers
  • Product Type: Power Supplies
  • Product Voltage: 120V
  • Series: 634 Series
  • Subcategory: Power Supply

Professional Applications

  • Commercial Building Security Systems
  • Multi-Door Access Control Installations
  • Healthcare Facility Access Control
  • Educational Institution Safety Systems
  • Industrial Facility Monitoring
  • Government and Municipal Buildings
  • Fire and Life Safety System Integration

Why Choose SDC Quality?

SDC 634 Series power supplies feature heavy-duty circuitry specifically designed for access control applications with UL 294, UL 603, and ULC-S318 certifications. The hybrid design addresses the unique power requirements that cause 75-85% of access control operating problems, delivering regulated and filtered power with comprehensive surge protection. Engineered for demanding commercial applications where reliable power delivery is essential for security system performance.

Manufacturer Resources

SDC Full Catalog

Product Specs

Subcategory:
Power Supply
Series:
634 Series
Product Group:
Electronic Access Controls
Product Subgroup:
Controllers, Power Supplies and Transformers
Commercial/Residential:
Commercial
Product Type:
Power Supplies
Electronic:
Yes
Current:
4A
Product Model:
634RF
Product Voltage:
120V
Product Category:
Electronic Access Controls
Department:
Door Hardware

SDC 634RF – Frequently Asked Questions

1) How many electric locks can a 4 amp access control power supply handle?
The 634 Series puts out 4 amps of regulated DC, which is what you budget against. Add the holding current of every lock on the supply plus anything else you are feeding from it (readers, controllers, strikes) and keep the total under 4A. Electric strikes and mag locks are inductive loads, and the 634 uses a hybrid design that pairs switching supply efficiency with linear supply inductive load handling, so it is built for that kind of draw rather than for electronics-only loads.
2) Will an SDC 634 power supply drop the locks when the fire alarm trips?
Yes. A fire/emergency release input is built into the 634, so the fire alarm relay wires straight to the supply and the connected locks release on alarm without a separate interface module. If you want the doors to stay released until someone physically clears the condition, order the unit with the Fire/Emergency Release Manual Reset Switch option. Without that option the supply restores power when the alarm signal clears.
3) What input voltage does the SDC 634 need, and is there a version for 230 volt power?
Standard input is 120 VAC. For overseas or 230 volt jobs, the 634 is orderable with a 230 VAC, 50/60 Hz input instead, and that option combines with any of the other choices (key lock cover, manual reset, on/off switch placement). Specify it at order time; it is an input configuration, not a field change.
4) Is the SDC 634 UL listed for access control?
Three listings are carried on the 634: UL 294 for Access Control System Units, UL 603 for Power Supplies for Burglar-Alarm Systems, and ULC-S318 for Canadian work. That covers most commercial access control and burglar alarm submittals, and the ULC listing matters if the job is in Canada.
5) Can I add relay outputs or a door controller to an SDC 634 power supply?
Door control modules mount inside the 634 and are chosen when you order. The lineup runs XUR-1 (microprocessor controller, two relays), XUR2-4 (four relays), XUR4-8 (eight relays), XFB4 multiple fused output relay for splitting the 4A across doors with individual fuse protection, XCR4 four station control relay, XACM-1 six station input control relay, XEMC exit device sequencer for a pair of doors that must release in order, and X12VR voltage control regulator for pulling a separate 12VDC feed. Order None (Standard) if you are only using the supply as a power source. The fused output board is the usual pick on a multi-door install so one shorted lock does not take the whole supply down.
6) What is the closest equivalent to the SDC 634 power supply from another brand?
The Securitron AQL4 is the nearest match in the switching family: it is a switching power supply rated 12/24VDC at 4/3 amps, so it covers the same dual voltage selection and the same 4 amp class of output as the SDC 634 Series, which is a regulated and filtered 4A supply with field selectable 12/24 VDC. The SDC 634 is a hybrid design that pairs switching efficiency with linear inductive load handling, and it carries a fire/emergency release input and an isolated battery charging circuit with low battery disconnect. The AQL4 is described as a straight switching supply. If the job needs the fire alarm interface built into the supply, the 634 Series carries it.
7) Is there a smaller power supply than the SDC 634 for a single door?
Yes. For one opening the Von Duprin PS902 base power supply is 2 amps at 12/24 VDC field selectable, and the RCI DKPS-2A gives 12/24VDC at 2A with 8 outputs. Both hold the same dual voltage flexibility as the SDC 634 Series but at half its 4 amp output. Smaller still, the Securitron AQD1 is a 12/24 VDC 1 amp switching supply and the Adams Rite PS-1 is a 1 amp regulated supply at 12/24 volts DC with battery backup. Step down only if the connected lock load and any future doors fit inside the lower amperage.
8) What should I use instead of the SDC 634 if 4 amps is not enough for the door count?
Move up in amperage. The BEST PS161-6 takes 120V input and gives 12/24V output at 6 amp capacity, which keeps the dual voltage selection the SDC 634 Series offers while adding headroom over its 4A. Larger again, the Securitron AQS1210 is a 12 VDC 10 amp switching supply, and the Altronix AL1024ULACMCB is a power supply and access power controller with 115VAC 60Hz input at 4.2A and 24VDC at 10A across 8 PTC outputs. Note that the AQS1210 is 12 VDC only and the AL1024ULACMCB output is 24VDC, so neither gives you the field selectable 12 or 24 choice the 634 Series and the PS161-6 both carry.
9) Is a plug-in transformer like the ROFU 9126T a substitute for the SDC 634 power supply?
No, and it is the most common mix-up in this family. The ROFU 9126T is a plug in mini power supply, 12 VDC at 1.5A with time delay - a single voltage, low current unit. The SDC 634 Series is a cabinet enclosure unit with 120V input, 4A output, field selectable 12/24 VDC, an isolated battery charging circuit, and a fire and emergency release input, and it accepts door control modules such as the XUR-1 two relay controller or the XUR4-8 eight relay controller. Use the 9126T only for a single small device; use the 634 Series where the system needs multi-door capacity, battery backup, or the fire alarm interface.
10) What supply do I use on a 230 volt 50 Hz job instead of a standard 120V unit?
The SDC 634 Series is configurable for 230 VAC, 50/60 Hz operation, so the same 4A regulated and filtered supply with field selectable 12/24 VDC output covers an international feed. By comparison the ROFU 9102-12D UL and 9102-24D take 10/120VAC 60Hz input, and the BEST PS161-6 is a 120V input unit. On a 230V 50 Hz service, specify the 634 Series with the 230 VAC option rather than a 120V only supply.
11) What options do I have to specify when ordering an SDC 634 Series power supply?
Five choices sit on the order form for the 634: 230 VAC 50/60 Hz input, a fire/emergency release manual reset switch, a key lock cover on the enclosure, a power on/off switch inside the cabinet, and a power on/off switch on the cabinet cover. Any combination is orderable, so 32 build variations exist. The two on/off switch options are separate line items, so decide whether you want the switch reachable without opening the box or hidden behind the cover.
12) Does the SDC 634 power supply support battery backup?
An isolated battery charging circuit is built into the 634, with low battery disconnect so a backup battery is not run flat and damaged. Batteries are sized and ordered separately based on how long you need the openings to stay powered after a utility loss.
13) Should I use a keyed cover on an access control power supply cabinet?
The key lock cover is an option on the 634 and it is worth taking anywhere the enclosure sits in a space the public or tenants can reach: a corridor, a stairwell, a shared electrical closet. Cutting power at the supply drops the locks, so an unsecured cabinet is a bypass. In a locked IT or security room it is usually unnecessary. If you take the keyed cover, think about where you put the power on/off switch as well, since the cover mounted switch is reachable without opening the box and the inside mounted one is not.
14) I only need to power one electric strike. Is a 4 amp supply overkill?
For a single opening it usually is. The 634 at 4 amps is sized for multi-door work and for adding relay modules later. A one door job is better served by something like the Command Access PS1, a 24VDC linear supply with 1 amp output, or the Securitron AQD1 switching supply at 12/24 VDC and 1 amp. Go to the 634 when you are feeding several locks off one cabinet, need the fire alarm release input, or want the door control modules inside the same enclosure.
15) Do I need a separate access power controller to distribute power to multiple doors from the SDC 634?
Not necessarily. The 634 takes door control modules inside its own enclosure, so relay switching and fused distribution can live in the same box, for example the XFB4 fused output relay board or the XUR2-4 four relay controller. The alternative approach is an integrated power supply and access power controller like the Altronix AL1024ULACMCB, which combines a 115VAC 60Hz input supply with eight PTC protected outputs at 24VDC. Pick the SDC route when you want to build up exactly the relay count you need; pick the Altronix when you want fixed multi-output distribution at 24V only.
16) What powers motorized latch retraction exit devices if the SDC 634 is not the right supply?
Motorized latch retraction has its own inrush profile and gets a dedicated supply. The BEST RPSMLR2 Series is a power supply built for motorized latch retraction exit devices. For delayed egress exit devices, the BEST PS161-6 is the supply built to that duty at 120V input and 12/24V output with 6A capacity. The SDC 634 Series is a general access control supply at 4A with field selectable 12/24 VDC, and its hybrid design handles inductive loads such as electric locks; where the exit device manufacturer calls out a specific latch retraction supply, use the one written on the spec.
17) I need a controller with logic and relays, not just power. What are the options next to the SDC 634?
Two directions. The SDC 634 Series takes door control modules inside the same cabinet: the XUR-1 microprocessor controller with two relays, the XUR2-4 with four relays, the XUR4-8 with eight relays, the XCR4 four station control relay, the XACM-1 six station input control relay, the XEMC exit device sequencer, or the XFB4 multiple fused output relay. Alternatively the Detex 10-800 Series is a universal logic controller with a 120VAC to 24VDC power supply and battery backup, and the Altronix AL1024ULACMCB combines a power supply and access power controller with 8 PTC outputs at 24VDC 10A. The BEST ELR150 Series is a power supply control module for electronic access control. Choose by whether you want the logic ordered with the supply or as a separate controller.
18) Which of these is not actually a power supply?
Two items in the same aisle are easy to grab by mistake. The ROFU 10305-LA and 10306-LA are power transfer hinges, tamper resistant, rated 1.5A at 42V in a plastic white finish - they carry current from frame to door, they do not generate it. The Command Access CAT Field Tester is a portable 12-24VDC unit that runs off DeWalt, Makita and Milwaukee batteries, a bench tool for proving a lock on the shop floor. Neither is a permanent system supply. The SDC 634 Series is the fixed 120V input, 4A DC unit that feeds the system.
19) Is the SDC 634 rated for commercial buildings or is it a residential unit?
Commercial. The 634 is built for commercial access control work, and the UL 294, UL 603 and ULC-S318 listings are what a healthcare, school, or government facility submittal will be looking for. Filtered and regulated output with input and output surge suppression is the part that matters on a facility with dirty power, since transients are what kill lock control boards.
20) What is the difference between the SDC 634 and the Locknetics LP Series power supply?
The Locknetics LP Series covers the 150 and 250 amp power supplies supplied with an enclosure. The SDC 634 Series is a 4 amp regulated and filtered low voltage unit with field selectable 12/24 VDC, a fire and emergency release input, and an isolated battery charging circuit, and it can be ordered with a key lock cover, a power on/off switch inside the cabinet or on the cover, and a fire and emergency release manual reset switch. Match the supply to the total connected lock load rather than to the brand already on the wall.
How fast can I get the SDC 634RF 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 634RF come with a warranty?
Absolutely. The SDC 634RF 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 634RF?
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
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