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Thermal switch TDS 247-Thermal differential switch TDS 247 with maximum section, for detecting open fires with and without smoke. It is used when disturbance variables such as dust, smoke or vapour are to be expected during operation. In hold-open systems, it must not be used for closures in escape and rescue routes.-Optical status indicator-Replacement indicator in accordance with DIN 14677-Measuring part monitoring-Communication connection for RS bus-Potential-free NC contact-Technical data Version in accordance with EN 54-5 A1 Operating voltage18 to 28 V DC Residual ripple 200 mV SS , current consumption at 28 V DC at rest/on alarm/on faultmax. 22/11/16 mA Relay contactsNC contact Switching voltagemax. 30 VDC Switching currentmax. 1 A Switching capacitymax. 30 W Protection classIP42 Ambient operating temperature-20 to +80 °C Weight60 g-Working principle thermodifferential-Optical signalling yes-Acoustic signalling no-Response temperature 60 °C-Smoke switch no-Mounting type Surface-mounted-Self-adhesive no
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