The Seco-Larm DH-151SQ is a UL Listed surface-mount magnetic door holder built for both residential and commercial applications. With a compact profile, fail-safe design, and flexible tri-voltage operation, it’s ideal for controlling automatic door release when paired with door closers.

• Strong 33-lb (15 kg) holding force with no residual magnetism for smooth release

• Supports 12/24 VAC/VDC and 120VAC power for versatile installation

• Adjustable armature plate simplifies alignment and setup

• Durable cast aluminum faceplate and built-in voltage spike suppressor

• Compatible with SECO-LARM door closers and optional extension bars for custom setups