{"product_id":"trolmaster-dry-contact-station-dsd-3","title":"TrolMaster DSD-3 Dry Contact Station | DIN Rail NO\/NC Relay Module","description":"\u003ch2\u003eTrolMaster DSD-3 Switches Equipment That Wants a Dry Contact\u003c\/h2\u003e\u003cp style=\"text-align: justify;\"\u003eMany dehumidifiers, HVAC units and commercial controllers accept a simple contact closure instead of switched power. The DSD-3 gives a TrolMaster controller that kind of output. Inside is \u003cstrong\u003eone relay with both a normally open and a normally closed contact\u003c\/strong\u003e, so you can pick the logic each device expects. It is dry contact only, which means it passes no voltage of its own and acts purely as an isolated switch. The contacts are rated \u003cstrong\u003e1A at 250VAC or 1A at 30VDC\u003c\/strong\u003e. The module takes its power and data from the controller over a single RJ12 cable. In the controller menu it can work as a temperature, humidity, CO2 or timer device. The front panel has Auto, Add\/Reset, On and Off buttons for local control. It snaps onto a standard DIN rail, which suits a panel or a TrolMaster controller cabinet. The box includes 0.5 ft and 4 ft RJ12 cables and a 4-pin terminal plug.\u003c\/p\u003e\u003ch2\u003eWiring the DIN Rail Dry Contact Station Into a Panel\u003c\/h2\u003e\u003cp style=\"text-align: justify;\"\u003eConnect it to the controller's device port, then press Add on the module. A pop-up on the controller confirms that the station has been addressed. The 4-pin terminal adds local override without touching the controller. Shorting the ON SWITCH pin to ground forces the relay closed, and shorting OFF SWITCH forces it open. Momentary or toggle switches both work for those inputs. The ON LIGHT pin puts out 12V at up to 50 mA while the relay is closed. That is enough for a 12V DC LED on the panel door, wired with its anode to ON LIGHT and cathode to ground. If manual switching does nothing, check that the switch wiring to GND is tight and actually completing the short. Label each module on the rail with the device it drives so troubleshooting stays quick. Keep it in a dry enclosure, since it is rated for 32 to 104°F and must not get wet.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\u003cul style=\"text-align: justify;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eNO and NC Contacts:\u003c\/strong\u003e One relay offers both normally open and normally closed terminals to match the equipment's logic.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolated Dry Contact:\u003c\/strong\u003e The output carries no voltage of its own, so it interfaces safely with external control circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour Controller Modes:\u003c\/strong\u003e Run it as a temperature, humidity, CO2 or timer device from the controller menu.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal Switch and Lamp Terminals:\u003c\/strong\u003e Wire ON and OFF wall switches plus a 12V status LED to the included terminal plug.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDIN Rail Mount:\u003c\/strong\u003e Snaps onto standard rail inside a panel or TrolMaster controller cabinet.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"text-align: justify;\"\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/p\u003e\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background-color:#333; color:#fff;\"\u003e\n\u003cth style=\"padding:8px; text-align:left;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"padding:8px; text-align:left;\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color:#fff;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003ePart number\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eDSD-3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eRelay\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e1 relay, NO and NC contacts, dry contact only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#fff;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eContact rating\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e1A @ 250VAC, 1A @ 30VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eInput\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e12V, 0.1A via RJ12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#fff;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eController modes\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eDST (temperature), DSH (humidity), DSC (CO2), DSP (timer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eIndicator output\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e12V DC, max 50 mA when relay is closed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#fff;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eMounting\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eDIN rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eOperating temperature\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e32–104°F (0–40°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#fff;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eOperating humidity\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e≤90% RH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eUnit dimensions\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e4.84 × 2.33 × 1.38 in (123 × 59.3 × 35 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#fff;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003ePackage dimensions\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e5.51 × 3.54 × 1.97 in (140 × 90 × 50 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eGross weight\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e0.44 lbs (0.20 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#fff;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003ePackage contents\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eDSD-3, 0.5 ft RJ12 cable, 4 ft RJ12 cable, 4-pin terminal plug\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"TrolMaster","offers":[{"title":"Default Title","offer_id":50527962497238,"sku":"DSD-3","price":94.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0723\/9450\/6454\/files\/trolmaster-dsd-3-main-v1.webp?v=1790264231","url":"https:\/\/growershouse.com\/products\/trolmaster-dry-contact-station-dsd-3","provider":"GrowersHouse","version":"1.0","type":"link"}