• Circuits And Controls

Electronic time relay

Type ETR10P electronic time relay is a solid state On delay timer that operates with high repeat accuracy between wide limits of voltage, frequency and temperatures. The timer uses a RC bridge type timing circuit, nullifying the effect of voltage variation, and a trigger circuit that switches an electro-magnetic relay giving smart and positive operation. Use of glass-epoxy PCB eliminates the chances of leakages or breakdown. The power supply is indicated by a green LED marked "V" (Voltage), while time out is indicated by a red LED marked "D" (Delay). The time setting is continuously adjustable and can be set on a fairly linear scale giving ten divisions of the particular range, on the dial. The timer comes in a moulded plastic casing with terminals on the top and bottom of the front side. The casing is dust and vermin proof and very light. The terminals are designed in slots so that live parts are not easily touchable. The timer is available both for flush mounting (ETR10F) and for projection/base mounting (ETR10P). In base mounting type the terminals are on the front and in flush mounting type the terminals are on the back. The timer is available for 24, 110, 220/240, 415 and 550 V AC 50-60 Hz, supply voltages and accommodates ambient temperature variation between -15?C and +55?C and voltage variation between 80% and 110%. It consumes about 6.5 VA current. The relay has two changeover contacts rated 6 A, at 240 V AC. Available time ranges are 0-6s, 0-10s, 0-30s, 0-60s, 0-3m, 0-10m, 0-30m with repeat accuracy ?1%. It is very economically priced and tested and certified by ETDC, Kolkata.