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Safety Relays & Glass Relays

Descriptions :
LT47, solid state overload relay, compares motor current with preset load current threshold (LOAD).
Motor currents are monitored through two internal current transformers.
CT hole size is 12 mm in diameter.
Please don’t allow excessive force on CTs.
D-Time counts down and is only available for motor starting.
During steady state, if motor current is greater than current setting(overloaded), LT47 switches its contacts after O-Time.
For shear-pin (mechanical shock) protection, set O-Time knob
to its minimum in order to trip in 0.2-0.3 s.

Categories: , Product ID: 29947


Notes :

If required, a ventilation hole can be made in the cover, reducing the protection type from IP67 to IP30.

If an outer contact (20) should weld, then the forced operated inner contact (12) driven by the actuator remains open. The rotating armature remains free to move. The unaffected contact pairs can operate normally, (i. e. their function to make or break remains unaffected).

If an inner contact should weld (12) then the movement of the rotating armature is blocked via the operator. Open contacts of all four contact pairs remain open. This arrangement corresponds to conventional, force-guided operation.

Technical data

Control Circuit

Nominal input voltage UN AC/DC 230 V
Input voltage range -15 … +20 %
Nominal input current at UN 14 mA
Load circuit

Number of break/switch-off contacts 4
Number of make/switch-on contacts 4
Contact material (relay) AgSnO2
Limiting continuous current 6 A
Switching voltage (max.) AC 250 V
Switching power (resistive) max. AC 1500 VA
Recommended minimum load 10 V / 10 mA
Pull-in time (typ.) 18ms
Drop-out time (typ.) 21ms
Bounce time (typ.) 4ms
Electrical life (NO; resistive load; 23 °C) 100 x 10³ switching operations
Mechanical life 10 x 10⁶ switching operations
Mechanical force-guided operation Type B
Safety and protection

Rated voltage 250V
Type of circuits Secondary circuits
Note on insulation parameters per EN 61010-1
Overvoltage category II
Pollution degree 2
Dielectric strength (control/load circuit) (AC, 1 min) 2.5 kVrms
Dielectric strength (open contact) (AC, 1 min) 1.3 kVrms
Dielectric strength (load/load circuit) (AC, 1 min) 2.5 kVrms
Insulation type (control/load circuit) Basic insulation
Insulation type (open contact) Functional insulation
Insulation type (load/load circuit) Basic insulation
Insulation type (adjacent devices) Reinforced insulation (safe isolation)
Connection data

Connection technology CAGE CLAMP®
WAGO connector WAGO 256 Series
Solid conductor 0.08 … 2.5 mm² / 28 … 12 AWG
Fine-stranded conductor 0.08 … 2.5 mm² / 28 … 12 AWG
Strip length 5 … 6 mm / 0.2 … 0.24 inches
Physical data

Width 63.5 mm / 2.5 inches
Height 85 mm / 3.346 inches
Depth from upper-edge of DIN-rail 40 mm / 1.575 inches
Mechanical data

Mounting type DIN-35 rail
Material Data

Color gray
Fire load 1.131MJ
Weight 113.3g
Environmental requirements

Ambient temperature (operation at UN) -40 … +70 °C
Surrounding air temperature (storage) -40 … +80 °C
Processing temperature -25 … +50 °C
Temperature range of connection cable ≥ (Tambient + 20 K)
Relative humidity 5 … 85 %
Operating altitude (max.) 2000m
Standards and specifications

Standards/specifications EN 60664-1
EN 50205
EN 61810-1
ESTI (SEV): 09.1133
UL 508: E120782
TÜV: 968/EZ 116.02/09


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