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REXROTH MSK030C-0900-NN-M1-UG1-NNNN R911308684
REXROTH MSK030C-0900-NN-M1-UG1-NNNN R911308684

Siemens MSI-20B 500-893081

Product Name:​ Siemens MSI-20B Dual-Action Intelligent Addressable Manual Fire Alarm Pull Station
Product Overview:​ A manual initiating device for Siemens intelligent fire alarm control panels, requiring two deliberate motions (lift cover + pull lever) to activate, reducing false alarms.
Category:
Description
Technical Specifications:​
  • Part Number:​ 500-893081
  • Operation:​ Dual-action (push up/lift cover then pull down lever)
  • Protocol:​ Siemens MXL, XLS, IXL/ICON-1, XL3 intelligent loops
  • Addressing:​ Electronic via DPU or FPI-32 programmer (no DIP switches)
  • Construction:​ Red matte polycarbonate, white raised lettering, shock/vibration resistant
  • Reset:​ Locked lever, reset with Allen key
  • Mounting:​ Surface (SB-5R box) or semi-flush
  • Dimensions:​ ~5.50 × 4.00 × 3.00 in
  • Certifications:​ UL Listed, USCG, FM, CSFM, NYC FD
    Functional Features:​
  • Dynamic Supervision:​ Continuous polling by FACP; line fault reported instantly.
  • Status Indication:​ Lever remains down post-activation until reset; visual confirmation.
  • Non-Metallic Housing:​ Corrosion-resistant for marine/offshore use.
    Application Scenarios:​ Commercial offices, schools, hospitals, marine vessels, government buildings, industrial plants.
    Material & Structure:​ High-impact UV-stabilized polycarbonate casing; stainless steel or nylon operating mechanism; terminal block inside for loop wiring.
    Working Principle:​ Activation closes a coded electronic switch on the SLC (Signaling Line Circuit); panel decodes address and reports “Manual Alarm” with location text.
    Installation Requirements:​ Follow NEC/EN fire circuit wiring practices; use listed backbox; maintain clear access per ADA/local codes.
    Precautions:​ Test regularly per NFPA 72; keep Allen key accessible for reset; do not paint over unit; verify address uniqueness on the loop before commissioning.
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