Bachmann CH221B Modular Fuse Holder

Overview

The CH221B is a modular fuse holder designed for industrial automation systems. It protects fuses that safeguard field wiring and connected devices. This accessory works with I/O modules to provide reliable overcurrent protection for digital and analog signals. Its modular design allows combination with other CH-series components for flexible system layouts. Optional LED indicators provide quick blown-fuse detection. The finger-safe housing ensures secure fuse retention. Maintenance is simple, allowing fast fuse replacement without removing wiring.

Technical Specifications

• Fuse Type: Compatible with standard 5 × 20 mm glass or ceramic fuses

• Voltage Rating: Up to 250 V AC/DC

• Current Rating: Depends on fuse used, typically 0.5 A to 6.3 A

• Contact Material: Tin-plated copper or brass for low resistance

• Connection Type: Screw or spring clamp terminals depending on variant

• Modular Design: Can integrate with other CH-series components

• Status Indication: Optional LED indicators for blown fuse detection

• Safety: Finger-safe housing with secure fuse retention

• Ease of Maintenance: Quick fuse replacement without removing wiring

Mechanical Design

• Mounting: DIN rail compatible

• Housing Material: Flame-retardant industrial-grade plastic

• Dimensions: Compact footprint suitable for dense cabinet layouts

• Labeling: Clear terminal markings for easy identification

Environmental Conditions

• Operating Temperature: −25°C to +60°C

• Storage Temperature: −40°C to +85°C

• Humidity: 5% to 95% non-condensing

• Vibration Resistance: IEC 60068-2-6 compliant