Overview
The Kraus & Naimer K3BM510HA is a KG41-series disconnect switch engineered for high-reliability load break and isolation duties in industrial control cabinets, motor starters, and distribution panels. This unit combines the base KG41 switch platform—rated 40A thermal current at 600V AC—with an M510A auxiliary contact block for enhanced control and status feedback. The switch meets IEC 60947-3 standards and is built for machine tool applications, switchboards, and maintenance disconnect service.
Key Features
- 40A thermal current rating with 600V AC nominal voltage across all poles
- Cam-operated M510A auxiliary contact block for feedback and interlocking
- Forced opening and closing of main contacts for positive mechanical engagement
- Compact design with large isolation distances between open contacts for safety
- Padlockable handle and fingerproof terminals on disconnect models
- Exceeds IEC 60947-3, EN 60947-3, and VDE 0660 standards
Technical Specifications
| Label | Value |
| Manufacturer | Kraus & Naimer |
| Model / Part Number | K3BM510HA / KG41-SS-428-06-05 |
| Series | KG41 Load Break Switch |
| Thermal Current (Ith) | 40 A |
| Rated Voltage | 600 V AC (3-phase) |
| Utilization Category | AC-23A (switch disconnector) |
| Motor Load (DOL) | 3 x 240V: 15 HP; 3 x 480V: 25 HP |
| Short-Circuit Withstand (1s) | 500 A |
| Rated Short-Circuit Making Capacity (Icm) | 3000 A peak |
| Auxiliary Contact Block | M510A (cam-operated) |
| Switching Function | ON/OFF (3 or 4 poles available) |
| Certifications | IEC 60947-3, EN 60947-3, VDE 0660, EN 60204 |
Typical Applications
- Machine tool control and main disconnects
- Distribution panel and switchboard isolation switches
- AC motor starter disconnect service (AC-23A category)
- Industrial maintenance and safety disconnect points
- Three-phase motor circuits up to 15–25 HP depending on voltage
- Emergency and lockout/tagout stations with padlock capability
Compatibility & Replacements
Compatible With
- IEC and EN standard motor control circuits (AC-23A utilization category)
- Three-phase 600V AC main distribution and branch circuits
- Standard industrial enclosure DIN rail and screw-terminal mounting
- Cam-operated auxiliary contact systems and interlocking schemes
- Motor control centers (MCCs) and industrial switchgear
Replaces / Drop-In Replacement For
- KG41-K300 (40A 600V disconnect switch)
- Verify exact model match (KG41-SS-428-06-05 configuration) with system integrator before ordering to confirm control logic and terminal pinout compatibility.
Works With
- IEC 60947-3 compliant motor starter packages
- Mechanical interlocking and manual chain operator systems
- Standard industrial 600V AC three-phase power distribution
- Auxiliary relay circuits and status feedback networks
- Padlock and emergency stop enclosure hardware
