HSS-L2D Dual Alarm, Surface Mount Contact

HSS Series | UL 634 LEVEL 2

   UL-634-Level 2 High Security

   Upgrade for existing BMS devices

   Easier to Install

 The HSS L2 SERIES is resistant to:







HSS-L2D  |   UL 634 Level 2
Dual Alarm, Surface Mount Contact

The L2D product offerings meet the UL634 Level 2 High Security Standard. The L2D series offers the choice of either two Closed Loop alarm contacts or one Closed Loop and one Open Loop alarm contacts. We offer a variety of embedded EOL resistor configurations and values for the HSS L2D Dual Closed Loop Alarm contact. If your needs require resistor values not shown, please contact MAGNASPHERE.


  • INTRINSICALLY SAFE, Simple Apparatus
  • Resistant to External and INTERNAL magnetic defeat
  • Replacement for existing BMS devices
  • No adjustment required for installation
  • Industry’s most secure removal tamper sensor/circuit
  • MAGNASPHERE® switch technology resists permanent contact welding (lightning, power surges, stun guns)
  • Single (L2S) and dual (L2D) alarm contacts available
  • American made using award-winning MAGNASPHERE switch technology
  • Compatible with control panel models that accept contact inputs
  • Built-in EOL resistors available
  • Competitively priced


Size: 4.25″ L x1″ W x 1.5″ H
[107.9 mm x 25.4 mm x 38.1 mm]
Max Gap: .25″ [.125″ Gap for UL 634 Level 2 Installation]
Housing: Aluminum Case, Silver-Gray Anodized
Electrical   Specifications: Max Current:     0.25A Resistive
Max Voltage:     30 VDC
Max Power:      .25 W
Configuration:  Either (1) two Closed Loop alarm contacts or (2) one Closed Loop and one Open Loop alarm contacts. Closed Loop Tamper circuit.
Wire Lead: #22 AWG, Solid Color-Coded and 36″ Armored Cable Standard. For other lengths, contact factory.
Operation Temp: -40° C to 80° C
Wiring Schematics / Part No.

Wiring schematics for the following part numbers are available on the Downloads page in this section:
  • HSS-L2D-000 HSS-L2D-001 HSS-L2D-002 HSS-L2D-003 HSS-L2D-004
  • HSS-L2D-007 HSS-L2D-008 HSS-L2D-010 HSS-L2D-011 HSS-L2D-012 HSS-L2D-013 HSS-L2D-014


HSS-L2D Dual Alarm, Surface Mount Contact 4.25″ L x 1″W  x 1.5″H


  • L      4.25” (107.9 mm)
  • H     1.5” (38.1 mm)
  • D     1.0” (25.4 mm)
  • S     3.5” ( 88.9 mm)
  • S1   0.75” (19.1 mm)
  • P     0.84” (21.3 mm)
  • P1   0.52” (13.2 mm)
  • E      3.03” (76.9 mm)
  • C      36.0” (914.4 mm) X  0.30″ (7.6 mm)

Stainless Steel Cable
0.125″ (3.18 mm)
Actuation Gap
(recommended for maximum internal magnetic non-defeat characteristics)  


MAGNASPHERE products are covered by U.S. and International Patents. Click to review each patent at the USPTO Patent Full-Text and Image Database.

US Patents