ZJ157F Series

ZJ157FT-L Interface Relay

Model ZJ157FT-L

slim socket-mount, LED & test button, 1/2-pole

Configuration1-Pole (1 Form C)
ModelZJ157FT-1PL
Contact arrangement1 × changeover (SPDT)
Contact materialSilver alloy (Ag alloy)
Max. resistive load12 A — 250 V AC / 30 V DC

Product Information

The ZJ157FT-L is the fully-featured version of the ZJ157F series — the same slim plug-in (socket-type) miniature intermediate-power interface relay (1-pole / 2-pole, silver-alloy contacts, 12 A / 8 A at 250 V AC / 30 V DC), combining a built-in LED status indicator with a lockable manual test button for on-site commissioning.

ZJ157FT-L interface relay

Key features

Lockable manual test button — operate / check the relay by hand on site
Built-in LED status indicator — shows coil energisation
Slim plug-in socket-type body, ~20 g — mounts on DIN-rail socket 157F-2Z-C3 (black or grey); plastic retaining hook 157F-S3, marker plate 14F-T
Silver-alloy contacts — 1-pole 12 A (1/3 HP) / 2-pole 8 A (1/6 HP) at 250 V AC / 30 V DC; ≤50 mΩ
High sensitivity — coil ~0.53 W (DC) / ~1.0 VA (AC); wide coil range 6–110 V DC / 6–240 V AC
High isolation — 4 kV (4000 V AC) contacts-to-coil; 3000 V AC between poles; insulation ≥1000 MΩ
Long life — 1×10⁷ mechanical / 1×10⁵ electrical operations; operate ≤20 ms, release ≤10 ms
−40…+55 °C; 5–85% RH; CE, UL

Plug-in system — relay plus matching DIN-rail socket (157F-2Z-C3), plastic retaining hook (157F-S3) and marker plate (14F-T):

ZJ157F relay, socket, hook and marker plate

Characteristics

Configuration	1-Pole (1 Form C)
Model	ZJ157FT-1PL
Contact arrangement	1 × changeover (SPDT)
Contact material	Silver alloy (Ag alloy)
Max. resistive load	12 A — 250 V AC / 30 V DC
Motor load	1/3 HP, 240 V AC
Max. switching power	3000 VA / 360 W
Rated voltage	250 V AC / 30 V DC
Pick-up voltage	≤75% (DC) / ≤80% (AC) of rated coil voltage
Drop-out voltage	≥10% (DC) / ≥30% (AC) of rated coil voltage
Max. coil voltage	110% of rated
Initial contact resistance	≤50 mΩ
Electrical endurance	1×10⁵ operations
Mechanical endurance	1×10⁷ operations
Operate time	≤20 ms (at rated voltage)
Release time	≤10 ms
Coil power	approx. 0.53 W (DC) / 1.0 VA (AC)
Coil voltage	6–110 V DC / 6–240 V AC
Dielectric — same-pole (open) contacts	1000 V AC, 50/60 Hz, 1 min
Dielectric — between poles	3000 V AC, 50/60 Hz, 1 min
Dielectric — contacts to coil	5000VAC
Insulation resistance	≥1000 MΩ (500 V DC)
Shock resistance	10 G (sine half-wave pulse, 11 ms)
Vibration resistance	10–55 Hz, double amplitude 1.0 mm
Ambient temperature	-40℃ ~ +70℃
Humidity	5% … 85% RH
Atmospheric pressure	86–106 kPa
Termination / mounting	Socket-type (plug-in)
Unit weight	approx. 20 g
Accessories	Socket 157F-2Z-C3 (black / grey) · plastic hook 157F-S3 · marker plate 14F-T
Suffixes	L = LED indicator · D / D1 = line-protection diode · T = lockable test button · B = decorative cover · coil 006–110 = 6–110 V DC, A006–A240 = 6–240 V AC
Maximum voltage	110% of rated voltage
Minimum switching voltage	5V / 10mA
Maximum continuous current	8A
Maximum inrush current	1Z (1PL): 16A 2Z (2PL): 10A (Resistive, 250VAC/30VDC, 70℃)
Minimum inrush current	10mA 5VDC
Max. rated power	2000VA (250 VAC)
Protection class	RT II / IP20
Storage & transport	-40℃ ~ +85℃
Altitude	≤ 2000 m

Specifications

Wiring diagram — bottom view, 1-pole (5-pin) and 2-pole (8-pin). The diagram shows the built-in LED across the coil; for DC coils observe polarity (optional line-protection diode D / D1). Coil 6–110 V DC / 6–240 V AC. Custom wiring on request.

ZJ157FT-1PLZJ157FT-2PL