Sprecher+Schuh KTA7-25S-20A Contactor
1. Product Overview
KTA7-25S-20A is a precision thermal overload relay in the Sprecher+Schuh KTA7 series, designed to provide reliable protection for three-phase motors below 20A. This product complies with the IEC 60947-4-1 standard and uses advanced temperature compensation technology.
2. Core parameters
Technical indicators Specifications
Current adjustment range 6.8-20A (continuously adjustable)
Rated insulation voltage 690V AC
Trip level Class 10A (fast trip)
Contact capacity 5A/250V AC (AC-15)
Protection level IP20
Ambient temperature range -25℃～+60℃
3. Structural features
Thermosensitive element: bimetallic strip with temperature compensation
Adjustment mechanism: precision gear transmission adjustment knob
Status indication: red mechanical trip indicator
Installation method: direct card installation of CA7 series contactor
Reset method: manual reset button (automatic reset model optional)
4. Protection characteristics
Overload protection: inverse time characteristic curve
Phase failure protection: fast action when >30% imbalance rate
Test function: TEST button simulates overload state
Environmental compensation: ±5% accuracy (-20℃～+50℃)
5. Technical characteristic curve
1.05×Ie: no action (cold state)
1.2×Ie: <15 minutes tripping
7.2×Ie: 4-10 seconds tripping
Cold state tolerance: 8×Ie for 10 seconds
6. Installation Guide
Mechanical installation:
Directly snap-in with CA7-20 contactor
±10° tilted installation is allowed
Electrical connection:
Main circuit: maximum 6mm² wire
Control circuit: maximum 2.5mm² wire
Safety distance:
Adjacent devices maintain ≥25mm distance