Seco-Larm SD-995C Fail-Secure or Fail-Safe Electric Door Str

The Verdict

If you’re securing a door that absolutely must not fail open during a power outage — think a server room, gun safe, or medication closet — the Seco-Larm SD-995C deserves a hard look. This isn’t a smart lock with apps and fingerprint readers; it’s a workhorse access control component designed to be hidden inside a door frame and triggered by a keypad, card reader, or push button.

What’s Actually in the Box

Seco-Larm doesn’t pad the package with junk. You get:

• The strike body with a brushed stainless steel faceplate
• Both flush mount and surface mount brackets
• A 12V/24V AC/DC solenoid rated for continuous duty
• Two plug-in voltage jumpers (one for fail-secure, one for fail-safe)

That’s it. No power supply, no controller — you’re expected to already have a 12V or 24V trigger source. The dual-voltage capability is a genuine plus; it means you can tie it into an existing alarm panel or standalone power supply without buying a converter.

Build Quality and Real-World Performance

The housing is cast metal, not stamped sheet steel. The faceplate is solid stainless. This matters because a flimsy strike will flex under repeated slamming, causing misalignment and eventual failure to latch. At roughly 1.5 pounds, the SD-995C has the heft of a commercial-grade unit.

The fail-secure/fail-safe switch is a physical jumper you move between two pins — takes about 30 seconds with a screwdriver. Fail-secure (default) means the strike stays locked when power is cut; fail-safe means it unlocks. This flexibility is rare at this price point, and it’s the reason many buyers choose it over cheaper fixed-mode strikes.

One thing buyers consistently note is how quietly it operates. A few reviewers describe it as a “soft thunk” rather than a loud clack. That’s a plus if you’re installing it near bedrooms or offices.

What Buyers Praise (With Their Words)

A 4.3-star average across 215 ratings tells a story of general satisfaction with occasional hiccups. The recurring praise centers on reliability:

• “Been installed on my shop door for 18 months, triggered by a keypad. Still latches perfectly every time.”
• “The fail-safe jumper saved me — I wired it to a fire alarm panel so the door unlocks automatically when the alarm sounds.”
• “Much heavier than the cheap $25 strikes I tried before. You can feel the difference when you close the door.”

The continuous-duty solenoid is worth calling out. Many budget strikes overheat after 5-10 minutes of sustained power, which is a fire hazard and a reliability nightmare. The SD-995C is rated for continuous energization, so it won’t cook itself if you leave the unlock signal active.

Where It Falls Short

First, the fixed faceplate dimensions. At 4-7/8" x 1-1/8", it won’t fit slimmer aluminum storefront frames without cutting. Measure your existing cutout before buying.

Second, there’s no integrated door position switch. If you need to know whether the door is actually closed (for an alarm system or automated locking), you’ll need the SD-995C-12V variant or add a separate magnetic contact. That’s an extra cost and an extra hole to drill.

Third, installation isn’t plug-and-play. You’ll need to know which wires go where on your power supply, and you’ll need a metal file or grinder to enlarge some standard residential cutouts. This is not a beginner-friendly project.

Who Should Buy This

• Small business owners securing a back office, storage room, or employee entrance with a keypad or card reader
• DIY home security enthusiasts who already have a 12V trigger source and want a commercial-grade strike without commercial pricing
• Integrators who need a field-configurable fail-secure/fail-safe option to stock for multiple jobs

Skip it if you only need a simple residential lock replacement, if your door frame is shallow (under 7/8" deep), or if you expect plug-and-play installation with minimal wiring knowledge.

FAQ

Q: Will this work with a standard 12V doorbell transformer? A: No. Doorbell transformers supply ~10VA, which isn’t enough to drive the solenoid reliably. You need a regulated 12V or 24V DC power supply rated at least 500mA, or an AC supply from an access control panel.

Q: Can I use this with a smart home system like Alexa or HomeKit? A: Not directly. You’d need a smart relay or dry-contact controller (like a Z-Wave or Wi-Fi relay) to trigger the strike. The strike itself is purely a mechanical latch — no smarts built in.

Q: How do I switch between fail-secure and fail-safe? A: Remove the faceplate, locate the two-pin jumper, and move it to the opposite position. It’s clearly labeled inside the housing. Takes under a minute.

The Verdict: 4.2/5

Buy it if you need a reliable, field-configurable electric strike for a commercial or high-traffic residential door, and you’re comfortable with basic wiring.

Skip it if you need door position monitoring, have a non-standard frame, or want a complete plug-and-play access control kit.

The SD-995C doesn’t try to be fancy — it just does its job, day after day. At this price, that’s exactly what you should expect, and it delivers.

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