PULL-WIRE SWITCHES
Among the pull-wire switches, this category brings together 39 items from eight series, from the TQ 201 in light alloy diecasting to the TQ 700 in a thermoplastic housing. The most strongly represented is the TQ 441 series with 9 items, followed by TQ 315 with 7 and TQ 215 with 6. Degree of protection, lifetime and wire length differ markedly from series to series; what they all have in common is the ETIM class EC000030.
The series compared
TQ 215 and TQ 315 (13 items together) have a housing of zinc diecast in norm construction design, IP66 and IP67, protection class I, 10,000,000 mechanical operating cycles and a maximum wire length of 25 m. The nine items of the TQ 441 are made of painted light-alloy diecast, IP65, with 30,000 operating cycles. TQ 900 (five items, zinc diecast) allows up to 50 m of wire and has an indicator lamp. The TQ 201 is connected via a shielded cable instead of screw terminals M20 x 1.5 and has degree of protection IP54. TQ 700 and TQ 700 S have a thermoplastic housing in IP67, the two PS 216 a wire length of 50 m and 100 m respectively.
Contacts and switching behaviour
The contact configuration is 1 NO contact and 1 NC contact on 12 items, two separate NC contacts (1 NC contact / 1 NC contact, all in the TQ 441) on seven and 2 NC contacts on six. Where the switching principle is stated (26 items), it is slow action, on 7 items with overlapping contacts. The thermal continuous current is 10 A on 28 items, 6 A on five and 1 A on another five. In utilisation category AC-15 Schmersal states 3 A or 4 A for 22 items, in DC-13 at 24 VDC 1 A to 4 A. The contact material is silver on 33 items and gold-plated silver on one.
Environment, standards and mounting notes
The ambient temperature is -40 to +80 °C on the TQ 201, -30 to +80 °C on TQ 215, TQ 315 and PS 216, -30 to +90 °C on the TQ 441 and -25 to +70 °C on TQ 700 and TQ 900. 37 items are listed to EN IEC 60947-5-1, twelve from the TQ 201, TQ 700 and TQ 900 series to EN ISO 13849-1; for these twelve a mission time of 20 years is also stated. 34 items have certificates, 30 of them cULus and CCC. On eight items Schmersal gives mounting notes, such as wire supports every 3 to 5 m for span lengths over 10 m and re-tensioning of the wire via eye bolt or turnbuckle after mounting.
