Zener Barrier Z896

Datasheet excerpt: Technical data of  Z896

Search characteristics
Additional functions
	Asymmetrical version	yes
General specifications
Type		DC version, negative polarity
Electrical specifications
Nominal resistance		terminals 1, 8: 320 Ω terminals 4, 5: 415 Ω
Series resistance		terminals 1, 8: max. 340 Ω terminals 4, 5: max. 437 Ω
Fuse rating		50 mA
Hazardous area connection
Connection		terminals 1, 2; 3, 4
Safe area connection
Connection		terminals 5, 6; 7, 8
Working voltage
	Supply loop	terminals 7, 8: max. 24.6 V terminals 5, 6: max. 19 V
	Measurement loop	terminals 7, 8: max. 24 V at 10 µA terminals 5, 6: max. 18 V at 10 µA
Conformity
Degree of protection		IEC 60529
Ambient conditions
Ambient temperature		-20 ... 60 °C (-4 ... 140 °F)
Storage temperature		-25 ... 70 °C (-13 ... 158 °F)
Relative humidity		max. 75 % , without condensation
Mechanical specifications
Degree of protection		IP20
Connection		screw terminals
Core cross-section		max. 2 x 2.5 ... mm2
Mass		approx. 150 g
Dimensions		12.5 x 115 x 110 mm (0.5 x 4.5 x 4.3 inch)
Construction type		modular terminal housing , see system description
Mounting		on 35 mm DIN mounting rail acc. to EN 60715:2001
Data for application in connection with hazardous areas
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] I (-20 °C ≤ Tamb ≤ 60 °C) [circuit(s) in zone 0/1/2]
	Voltage	terminals 1, 2: 26.6 V; terminals 3, 4: 20.5 V
	Current	terminals 1, 2: 85 mA; terminals 3, 4: 50 mA
	Power	terminals 1, 2: 560 mW; terminals 3, 4: 260 mW
Supply
	Maximum safe voltage	250 V
Series resistance		terminals 1, 2: min. 314 Ω; terminals 3, 4: min. 407 Ω
Certificate		TÜV 99 ATEX 1484 X
	Marking	II 3G Ex nA IIC T4 Gc [device in zone 2]
Directive conformity
	Directive 2014/34/EU	EN 60079-0:2012+A11:2013 , EN 60079-11:2012 , EN 60079-15:2010
International approvals
FM approval
	Control drawing	116-0118
UL approval
	Control drawing	116-0139 (cULus)
IECEx approval		IECEx BAS 09.0142 IECEx BAS 17.0091X
	Approved for	[Ex ia Ga] IIC , [Ex ia Da] IIIC , [Ex ia Ma] I Ex ec IIC T4 Gc
General information
Supplementary information		Observe the certificates, declarations of conformity, instruction manuals, and manuals where applicable. For information see www.pepperl-fuchs.com.

Documents: Z896

CAD+CAE: Z896

Approvals+Certificates: Z896

Function: Z896

The Zener Barrier prevents the transfer of unacceptably high energy from the safe area into the hazardous area.

The zener diodes in the Zener Barrier are connected in the reverse direction. The breakdown voltage of the diodes is not exceeded in normal operation. If this voltage is exceeded, due to a fault in the safe area, the diodes start to conduct, causing the fuse to blow. The Zener Barrier has a negative polarity, i. e. the cathodes of the zener diodes are grounded.

Asymmetrical Zener Barriers are for optimization of applications which have different voltage levels regarding to ground potential.

Depending on the application, increased or decreased intrinsic safety parameters apply for serial or parallel connection. For the detailed parameters refer to the Zener Barrier certificate. Application examples can be found in the system description of the Zener Barriers.