Sprecher+Schuh KTA7-25H-25A relay
1. Product Positioning
KTA7-25H-25A is a professional-grade thermal overload relay in the KTA7 series of Sprecher+Schuh, mainly used for the protection and control of three-phase asynchronous motors, in compliance with the IEC 60947-4-1 standard.
2. Core functional characteristics
Current protection range: 8-25A continuously adjustable
Protection function:
Overload protection (inverse time characteristic)
Phase failure protection (acts when phase imbalance >30%)
Start-up timeout protection
Action characteristics:
No action at 1.05×Ie (cold state)
Action time <20 minutes at 1.2×Ie
Action time 2-10 seconds at 7.2×Ie
3. Mechanical and electrical parameters
Parameter category Technical specifications
Rated insulation voltage 690V AC
Rated working current 25A (AC-3)
Contact capacity 5A/250V AC (AC-15)
Mechanical life 10,000 operations
Electrical life 1,000 times breaking rated current
Ambient temperature range -25℃～+60℃
4. Structural features
Adopt bimetallic thermal memory technology
With test/reset function button
Rotary current setting knob (with clear scale)
Mechanical indication window for tripping status
Modular design, can be directly mounted on CA7 series contactors