- Used in conjunction with an XSB or XSA strobe to provide visual indication of a ringing SigTEL Type A (fire telephone) or Type B (disabled refuge) outstation.
- Can also be used to trigger a compatible 12V DC sounder (max. peak output current of sounder must not exceed 1A).
- Power to operate the strobe or sounder must be derived from a separate 12V DC PSU.
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