May 27, 2026

B&R 0TB704.91 Power Terminal Block

The B&R 0TB704.91 is a single‑row 4‑pin push‑in power terminal block designed for compact and reliable power distribution and fieldbus connection in industrial automation. Supporting up to 2.5 mm² copper conductors, 300 V rated voltage and 10 A rated current per contact, it enables fast, tool‑free wiring with its push‑in connection system. The robust thermoplastic housing provides excellent insulation and mechanical strength, while the touch‑safe design prevents accidental contact with live parts. As a dedicated power and signal interface for B&R control systems, it is ideal for space‑saving installations in control cabinets and field devices.

Description

B&R 0TB704.91 Power Terminal Block

Product Introduction

Basic Information

Model: 0TB704.91
Brand: B&R (Bernecker + Rainer, ABB Group)
Product Type: Industrial push‑in power terminal block
Number of Pins: 4 (single‑row)
Connection Type: Push‑in (tool‑free)
Pitch: Standard spacing
Wire Cross‑Section: 0.2–2.5 mm² (solid/fine‑stranded copper); 0.2–1.5 mm² (with ferrule); 26–12 AWG
Rated Voltage: 300 VAC/VDC
Rated Current: 10 A per contact
Housing Material: High‑strength thermoplastic
Protection Class: IP20
Operating Temperature: -25°C to +70°C
Certifications: CE, UL/cULus compliant
Origin: Imported (Austria)
Features: Tool‑free push‑in connection, compact 4‑pin design, touch‑safe, vibration‑resistant

Function and Positioning

The 0TB704.91 functions as a compact power supply and fieldbus connection terminal block for B&R I/O modules, PLCs, and power supply units. It provides secure, maintenance‑free electrical connections for 24 VDC to 300 V power distribution, low‑power sensors, actuators, and fieldbus communication lines. The push‑in mechanism allows fast, tool‑free insertion of wires, reducing installation time and labor costs. Its vibration‑resistant design ensures stable connections even in harsh industrial environments. Positioned as a cost‑effective, space‑saving connection solution, it is suitable for standard industrial applications requiring reliable power and signal wiring.

Core Performance Parameters

Connection System: Push‑in, tool‑free operation
Conductor Type: Copper only (solid, stranded, fine‑stranded; no aluminum)
Rated Voltage: 300 VAC/VDC (max)
Rated Current: 10 A per contact, 40 A total
Contact Resistance: ≤5 mΩ (initial)
Dielectric Strength: 2.0 kV AC (1 minute)
Vibration Resistance: Compliant with EN 60068‑2‑6
Durability: ≥50 insertion/removal cycles
Safety: Touch‑safe, no exposed live parts
Compatibility: Matches B&R X20/X67 I/O module footprints and standard control system interfaces

General Compatible Accessories

B&R X20/X67 series I/O modules and PLCs
B&R 0TB series terminal blocks (0TB103.91, 0TB112.91, 0TB2105.9110, 0TB3102‑7011)
B&R 24–300 VDC power supply modules
B&R ACOPOS servo drives and motion control systems
Standard 35 mm DIN rails and mounting hardware
Industrial power cables and wire end sleeves (0.2–2.5 mm²)
Labeling strips and cable markers for terminal identification
EMC filters and surge protectors for low‑power circuits
B&R Automation Studio for system configuration and diagnostics

Applicable Equipment Fields

Industrial Control Cabinets: Compact power distribution for B&R I/O and PLC systems
Machine Building: Standard machinery, packaging equipment, and conveyor systems
Process Automation: Light chemical, food and beverage, and pharmaceutical plants
Building Automation: HVAC systems, lighting control, and security systems
Motion Control: Low‑power servo systems and motor control units
Automotive: Auxiliary production lines and testing equipment
System Integration: Panel building, retrofit projects, and compact automation systems
Industrial IoT: Edge computing nodes and low‑power sensor networks

Contact Info