ZJ157F Series

ZJ157F-B Interface Relay

Model ZJ157F-B

slim socket-mount, decorative cover plate, 1/2-pole, high sensitivity

Configuration1-Pole (1 Form C)
ModelZJ157F-1PB
Contact arrangement1 × changeover (SPDT)
Contact materialSilver alloy (Ag alloy)
Max. resistive load12 A — 250 V AC / 30 V DC

Product Information

The ZJ157F-B is the covered version of the ZJ157F series — electrically identical to the base ZJ157F, 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), fitted with a protective decorative cover plate for a clean panel finish and added contact protection.

ZJ157F-B interface relay

Key features

Decorative cover plate (“-B”) — clean panel finish and contact protection; no LED or test button
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	ZJ157F-1PB
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°C...70°C
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	16A
Minimum inrush current	10 mA (5V)
Max. rated power	2000VA (250 VAC)
Protection class	RT II / IP54
Storage & transport	-40°C...70°C
Altitude	≤ 2000 m