Seco-Larm - SD-998CM-SD3A - 1/2″ Tamper-Resistant Electric Rim Strike with Latch Monitoring

Product Overview

The SECO-LARM SD-998CM-SD3A is a tamper-resistant surface-mount electric rim strike with latch monitoring for rim-type exit devices with a Pullman latch. It supports 12/24VDC operation, field-selectable fail-safe or fail-secure modes, horizontal adjustment, and reversible non-handed installation without requiring frame cutting.

Key Configuration

Model: SD-998CM-SD3A | Product Type: Surface-mount electric rim strike with latch monitoring | Voltage: 12/24VDC | Latch Compatibility: Up to 3/4-inch Pullman latch | Operation: Fail-safe or fail-secure selectable | Construction: Stainless steel | Installation: Surface mount on metal or wood frames | Use: Indoor only | Listings: UL 294 and UL 1034

Key Features

• · Designed for rim-type exit devices with a 1/2-inch latch throw
• · Accommodates Pullman latches up to 3/4 inch
• · 12/24VDC operating voltage with non-polarized connection
• · Field-selectable fail-safe or fail-secure operation
• · Latch monitoring for exit-device status feedback
• · Horizontal adjustment for installation alignment
• · Reversible non-handed design for flexible door orientation
• · Tamper-resistant stainless steel construction
• · 1,500-lb (6673N) static strength and UL-tested 250,000-cycle rating
• · UL 294 and UL 1034 Listed for indoor access-control applications

Technical Context

The SD-998CM-SD3A releases a rim-type exit device when energized and can be configured for fail-safe or fail-secure behavior to match the access-control design. Its latch-monitoring function provides status feedback, while the surface-mount housing avoids cutting the door frame during installation.

Installation Notes

Surface-mount the strike on a suitable indoor metal or wood frame and align it with the compatible Pullman latch. Use the included spacers for fit adjustment, select the required fail-safe or fail-secure mode, and connect the unit to a compatible 12/24VDC access-control circuit. Use with UL Listed exit hardware and verify that installation does not impair emergency or panic-hardware operation.