Thermal overload relay ISKRA BR30

for switch ISKRA KNL22...38

Description

Features

According to IEC/EN 60947-4-1, IEC60947-5-1; UL508
3-pole overload relay
Protection for motors up to 38A operating current and 690V operating voltage
Electrically isolated auxiliary contacts (1 normally closed, 1 normally open)
Selectable manual or automatic reset
Phase failure sensitivity according to IEC/EN 60947-4-1
Temperature compensation
UL approval

Series Specifications

Rated operating voltage Ue

690 V

Surge voltage withstand strength Uimp

6 kV

Permissible operating temperature

-5°C ... +55°C

Protection class

IP20

Installation position

Arbitrary

Fastening

Hooking onto the contactor, securing with screws in the main connection terminals.

Terminal connections

Terminal blocks

Connection cross-sections

2x 1.0 - 10 sqmm (fine-stranded with AEH)

Connection cross-sections auxiliary contacts

2x 0.75-2.5 mm² (fine-stranded with AEH)

Trigger class

Switching frequency

Up to 15 circuits/h or 60 circuits/h with 40%.

Settings and notes - see also "More images".

Warning:

Insufficiently tightened clamping screws can lead to unacceptable heating. The device may only be connected by qualified personnel. Do not touch live parts!

Startup Verification:

Press the "O" push button to reset the relay. By pressing the slider "2" in the direction of the arrow, the device will activate. The contact 95-96 opens, and the contact 97-98 closes. In the off state, the switching position indicator shows "1" in yellow.

Setting to Motor Rated Current:

The setting to motor rated current is done by turning the setting knob (3) until the point of the knob is at the desired rated current value.

Switching from Manual to Automatic Reset:

Manual Reset:

The triggered overload protection is reset with the "R" button (4). Please ensure sufficient cooling time.

Automatic Reset:

Press and hold the "R" button (4) while moving the slider (5) in the direction of the arrow until it clicks into place. After releasing the slider, the "R" button (4) must remain pressed.

Auxiliary Switch:

Open contact 95-96 and closed contact 97-98 are galvanically separated. Short-circuit protection of the auxiliary switch 6A. The closed auxiliary contact 97-98 can activate a signaling circuit. A single-pole changeover contact can be achieved by inserting a bridge between terminals 95 and 97.

Additional Views and Drawings