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Overview
The Schlegel Elektrokontakt BTO is a precision-engineered momentary switch designed for industrial control systems, automation, and electrical equipment requiring reliable switching performance. This switch features Faston terminals (2.8 x 0.8 mm) for secure, low-resistance connections and AgNi (silver-nickel) contact material, ensuring consistent conductivity and long service life. The 2x NC (normally closed) configuration provides fail-safe operation, meeting EN 60947-5-1 standards for positive opening contacts.
Key specifications include a rated insulation voltage of 300V, thermal continuous current of 16A, and a rated operating voltage of 240V AC (AC15) with 3A current. For DC applications, it supports 250V (0.2A) and 24V (2A) under DC13 conditions. The switch delivers a mechanical and electrical lifetime of 1 million switching cycles at rated load, ensuring durability in high-cycle applications. Optional illumination is available with 24V AC/DC operation at 11mA current, compatible with module holders like MKHR_3 for emergency-stop applications.
Built to German engineering standards, the BTO switch is ideal for control panels, automation systems, and machinery requiring momentary switching with reliable contact performance. Its modular design and push-in connection compatibility (0.14–1.5 mm², AWG 26–14) simplify installation and maintenance. Distributed globally with local support, the BTO switch is manufactured by Georg Schlegel GmbH & Co. KG in Dürmentingen, Germany.
- 2x NC (normally closed) configuration with positive opening contacts per EN 60947-5-1
- Faston terminals (2.8 x 0.8 mm) for secure, low-resistance connections
- AgNi contact material for consistent conductivity and long service life
- Rated insulation voltage: 300V, thermal current: 16A
- Mechanical/electrical lifetime: 1 million switching cycles at rated load
Specifications
Connection Type | Faston Terminals 2.8 X 0.8 Mm |
Material | AgNi |
Poles | 2x NC |

BT_439
Switching Function: Momentary Travel: 3 mmContact Type: Faston Terminal 2.8 x 0.8 mm Contact Equipment: 2 x NC + 2 x NOContact Material: AgNiIP Protection Front: IP00 Protection Class: II (protective insulation)
M22
Shape: RoundMounting Dimension: � 22.3 mm (0.88 inch)Base Material: PlasticProduct Group: Accessories for Pushbuttons and Switches
TK26S
Shape: RoundColor: Transparent IP Protection Front: IP67Certifications: CE ROHS UL CSAProduct Group: Pushbuttons and Switches
TK28S
IP Protection Front: IP67 Shape: RoundColor: TransparentCertifications: CE ROHS UL CSAProduct Group: Pushbuttons and Switches
AL5
Labeling Option: NoContact Type: Faston Terminals 2.8 X 0.8 Mm Lambholder: T55KProtection Class: II (protective insulation)Contact Equipment: Lampholder