The Zener Barrier Z954 is a 3-channel AC version barrier designed to prevent surges of energy from entering hazardous areas. It acts as a safety device for electrical signals transmitted between safe and hazardous zones.

Here’s a breakdown of the key points and specifications:

General Features:

• Channels: 3
• Version: AC
• Mounting: DIN rail mountable

Electrical Specifications:

• Nominal Resistance: 12 Ω
• Series Resistance (Max): 27.27 Ω
• Fuse Rating: 50 mA
• Working Voltage:
  • Supply Loop (Max): 3.7 V
  • Measurement Loop (Max): 0.6 V at 1 µA
• Conformity: IP20 (protected against objects larger than 12.5mm and dust)

Environmental Conditions:

• Operating Temperature: -20°C to 60°C (-4°F to 140°F)
• Storage Temperature: -25°C to 70°C (-13°F to 158°F)
• Relative Humidity (Max): 75% (non-condensing)  

Hazardous Area Connection: Terminals 1, 2; 2, 3; 2, 4 Safe Area Connection: Terminals 5, 7; 6, 7; 8, 7

Hazardous Area Approvals:

• EU-Type Examination Certificate: BAS 01 ATEX 7005
• Marking: II (1)GD, I (M1) [Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] IV
• Voltage: 4.5 V
• Current: 383 mA
• Power: 430 mW
• Supply Maximum Safe Voltage: 250 V
• Series Resistance (Min): 11.76 Ω
• Certificate: TÜV 99 ATEX 1484
• Marking: II 3G Ex nA IIC T4 Gc
• Directive Conformity: Directive 2014/34/EU (ATEX 139)
• International Approvals: FM, UL/cULus, IECEx

Pepperl+Fuchs, Zener Barrier 3-channel, AC version, Working voltage 0.6 V at 1 µA, Series resistance max. 27.27 Ω, Fuse rating 50 mA, DIN rail mountable, Type: AC version