Koyo Electronics KT-V4S-C-D Digital Timer Relay

KOYO's KT-V4S-C-D Digital Timer Relay is a four‑digit timer with dual outputs (NPN open‑collector DC output and SPDT relay) designed for precise timing control in automation systems, powered from 20–28 VDC (nominal 24 V). It offers ten selectable timing ranges from 0.001 s up to 99 h 59 m and supports multiple modes—on‑delay, off‑delay, one‑shot, accumulator, and flicker (flicker mode can drive an alarm output). The unit features a two‑line LED display: current value shown in red with a 12 mm character height and preset value in green with a 7 mm height. Input logic is selectable for positive or negative logic; start input thresholds are 0–3 V for a low level and 7–30 V for a high level, with input resistance around 15 kΩ for positive logic and 3.3 kΩ for negative logic. The DC output is a 24 V, 100 mA NPN open‑collector, complemented by a second SPDT relay output for switching loads. Memory is EEPROM‑based with nonvolatile storage, rated for up to about 100,000 write cycles and an estimated 10‑year data retention. Mounting is 1/16 DIN with front‑panel IP65 protection when installed in an appropriate enclosure; operating temperature spans −10 to 50 °C and relative humidity 35–85% RH. The KT‑V4S‑C‑D combines compact panel‑mount convenience with versatile timing functions, making it suitable for industrial controls, sequencing, and process automation where precise multi‑range timing and dual‑output control are required.