uxcell - a12111600ux0539 AC 110V 8P Rango de 0-60 Minutos Regulable Temporizador Retraso Temporizador Relé AH3-3 + Base

Pour un système de sécurité.

Excellent unit, but I ordered 0-60 minutes vs 0 to 60 Seconds. Worked well, but returned due to ordering wrong part!

purchased 2 of these on delay relays to add another line of defense against power blipps that cause my house a/c system to fail due to the system compressor trying to restart immediately under max head pressure resulting in a blown start/run capacitor. installed the on delay relay in system control circuit to delay restart of the system for app 3 minutes to allow the system pressures to equalize and allow the compressor to restart with minimum load--works great--great product for the money. also installed one for my house refrigerators and freezer to prevent compressor restarts and failures.

Buen producto

bien reçus tel que décrit

This timer relay is constructed of typical commercial components and should provide long service life provided certain precautions are taken. It is an excellent buy for a low cost timed relay as many similar units are priced ten times higher. However, like many Pacific Rim manufacturers, this particular device’s specifications are really pushing the envelope. It is as if the marketing department is not cognizant as to how the unit is constructed and is possibly why the specifications are incomplete.Many commenters answering questions on this component also do not understand the internal electronics of this device and are merely guessing due to the schematic pictorial on the unit’s side. A few people seem to believe the device is a timed relay with double pole – double throw contacts, which is far from the truth. Others seem to think the coil voltage will work on almost anything (AC or DC at any voltage) while the actual truth is it will ONLY work on 120 V AC.When I received three of these relays for a low cost design project, the devices did not come with any paperwork as to specifications, connections, or typical applications. The relays had a tiny label on the front stating 120 V AC, which I assumed indicated the intended coil voltage. Using the relay’s side case schematic, I connected 120 V AC to the relay’s coil (pins 2 & 7) and started to monitor the reactions at the contacts. Only then did the confusion really set in.My background was as a lead development electrical engineer for a Fortune 500 computer company for 25 years. Even though now retired, I am well versed in all types of electronics and decided an investigation of the internal workings would be necessary if I was to use this device. I spent an afternoon disassembling and developing the actual internal schematic. My general findings are as follows and should help anyone wanting to use these relays.The defined coil pins feed an internal common step-down AC transformer (120 to 24 V AC) that is used to power the relay’s internal electronics. Using a transformer removes any possibility of using DC to power this unit. After the transformer, the low voltage AC is rectified to provide DC power to the timer circuit (an LM8445) and TWO internal SPDT relays, which in turn connect to the external contacts per the relay’s side schematic.One internal DC relay ACTIVATES IMMEDIATELY when the main device’s coil receives its 120 V AC. It would be similar to a standard 120 V AC coil relay operating with single pole – double throw contacts (1C) - Output pin 1 (common), pin 3 (normally open), pin 4 (normally closed). This first relay is unaffected by any timing operation and switches off when AC power is removed from the relay coil pins.The second internal relay is activated by the relay’s internal timing circuit where the delay is determined by the external knob (seconds to one hour). The relay case schematic shows these output pins as – Pin 8 (common), Pin 5 (normally closed), and pin 6 (normally open). This internal DC relay activates upon completion of the internal delay timer.The two small LEDs next to the timing knob show the state of the timing circuit. When power is first applied, the LED ON illuminates. When the timing circuit completes, the LED ON light extinguishes and the LED UP turns on from its previous non illuminated state.Side Note: This relay requires voltage on the coil pins to operate. Removal of the coil voltage will almost immediately reset both the internal relays to their off state. No timing operation can occur without AC relay coil power as the internal DC source voltage disappears within milliseconds.Contact clarification: The internal 24 V DC relays used in my device were Omron G6E-134P components. These are well known devices within the electronics industry but their contacts are rated at 2 Amperes resistive at up to 250 V. AC. They are primarily to be used for signaling (triggers for higher current switching devices). In other words, these relays are not intended for any significant loads such as motors or high draw lighting circuits. The external case wording indicates the device can switch 5 ampere loads but that is in major contradiction to the Omron relay specification.Conclusion: This device is a fairly well built timing relay but it will not switch significant loads of more than an ampere or possibly two. Using this device to directly drive motors or other heavy inductive or even resistive loads will shorten its life considerably. In spite of these shortcomings, this timing relay is an excellent buy compared to other similar commercial units.In my application where the switched current will be low, I am confident these relays will have a long life span.