Inosaki – Your Trusted Phoenix Contact Distributor
Inosaki proudly stands as one of the largest distributors of Phoenix Contact products, offering a comprehensive range of terminal blocks, interface modules, power supplies, and relays.

Our Best-Selling Terminal Blocks: Feed-Through, Fuse Modular, Spring Cage, Double Level, Multi-Level

Series Models: PT Series, ST Series, TB Series, UT Series, and UK Series, PTV Series, UKH Series, Micro Series.

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Commercial Data

Item number	1277638
Packing unit	50 pc
Minimum order quantity	50 pc
Product key	BE1134
GTIN	4063151471897
Weight per piece (including packing)	14.69 g
Weight per piece (excluding packing)	14.69 g
Customs tariff number	85369095
Country of origin	CN

Notes

General
Note	The current is determined by the fuse used, the voltage by the fuse or selected light indicator.
	When using fuse terminal blocks in a compound arrangement, the D-UT 2,5/4-TWIN end cover (3047141) must be inserted at each fuse terminal block or a UT 2,5-MTS-EX terminal block (1277636) must be used between each fuse terminal block.
	When using partition plates between the fuse terminal blocks, FBS bridges cannot be used due to the separation.

Product Properties

Product type	Fuse terminal block
Area of application	Process industry
	Machine building
	Plant engineering
Number of connections	2
Number of rows	1
Insulation characteristics
Overvoltage category	III
Degree of pollution	3

Electrical Properties

Fuse type	Glass / ceramics / …
Rated surge voltage	6 kV
Maximum power dissipation for nominal condition	0.77 W
Fuse	G / 5 x 20
Maximum power dissipation	max. 1.6 W (with single arrangement of the fuse terminal block in the event of overload)
	max. 1.6 W (With interconnected arrangement of several fuse terminal blocks in the event of overload)
	max. 4 W (with single arrangement of the fuse terminal block in the event of a short-circuit)
	max. 2.5 W (With interconnected arrangement of several fuse terminal blocks in the event of a short-circuit)

Connection Data

Number of connections per level	2
Nominal cross section	2.5 mm²
Screw thread	M3
Tightening torque	0.5 Nm
Stripping length	9 mm
Internal cylindrical gage	A3
Nominal cross section	2.5 mm²

Ex Data

Rated data (ATEX/IECEx)
Identification	 II 3 G Ex ec llC Gc
Operating temperature range	-50 °C … 130 °C
Ex-certified accessories	3047141 D-UT 2,5/4-TWIN
	1205053 SZS 0,6X3,5
	3022276 CLIPFIX 35-5
	3022218 CLIPFIX 35
List of bridges	Plug-in bridge / FBS 2-5 / 3030161
	Plug-in bridge / FBS 3-5 / 3030174
	Plug-in bridge / FBS 4-5 / 3030187
	Plug-in bridge / FBS 5-5 / 3030190
	Plug-in bridge / FBS 10-5 / 3030213
	Plug-in bridge / FBS 20-5 / 3030226
Bridge data	6.3 A / 2.5 mm²
Rated insulation voltage	250 V
output	(Permanent)
Ex level General
Rated voltage	275 V
Rated current	6.3 A (2.5 mm²)
Maximum load current	6.3 A (4 mm²)
Contact resistance	0.5 mΩ
Ex connection data General
Torque range	0.5 Nm … 0.6 Nm
Nominal cross section	2.5 mm²
Rated cross section AWG	14
Connection capacity rigid	0.14 mm² … 4 mm²
Connection capacity AWG	26 … 12
Connection capacity flexible	0.14 mm² … 4 mm²
Connection capacity AWG	26 … 12
2 conductors with same cross section, solid	0.14 mm² … 1.5 mm²
2 conductors with the same cross-section AWG rigid	26 … 16
2 conductors with same cross section, stranded	0.14 mm² … 1.5 mm²
2 conductors with the same cross-section AWG flexible	26 … 16
Conductor cross section flexible, with ferrule without plastic sleeve min.	0.14 mm²
Conductor cross section flexible, with ferrule without plastic sleeve max.	2.5 mm²
Single conductor/terminal point, flexible, with ferrule, without plastic sleeve, AWG	26 … 14

Dimensions

Width	6.2 mm
Height	57.8 mm
Depth on NS 35/7,5	75.6 mm
Depth on NS 35/15	83.1 mm

Material Specifications

Color	black (RAL 9005)
Flammability rating according to UL 94	V0
Insulating material group	I
Insulating material	PA
Static insulating material application in cold	-60 °C
Relative insulation material temperature index (Elec., UL 746 B)	130 °C
Fire protection for rail vehicles (DIN EN 45545-2) R22	HL 1 – HL 3
Fire protection for rail vehicles (DIN EN 45545-2) R23	HL 1 – HL 3
Fire protection for rail vehicles (DIN EN 45545-2) R24	HL 1 – HL 3
Fire protection for rail vehicles (DIN EN 45545-2) R26	HL 1 – HL 3
Surface flammability NFPA 130 (ASTM E 162)	passed
Specific optical density of smoke NFPA 130 (ASTM E 662)	passed
Smoke gas toxicity NFPA 130 (SMP 800C)	passed

Mechanical Properties

Mechanical data
Open side panel	No

Environmental and real-life conditions

Oscillation/broadband noise
Specification	DIN EN 50155 (VDE 0115-200):2018-05
Spectrum	Long life test category 2, bogie-mounted
Frequency	f₁ = 5 Hz to f₂ = 250 Hz
ASD level	6.12 (m/s²)²/Hz
Acceleration	3.12g
Test duration per axis	5 h
Test directions	X-, Y- and Z-axis
Result	Test passed
Shocks
Specification	DIN EN 50155 (VDE 0115-200):2018-05
Pulse shape	Half-sine
Acceleration	30g
Shock duration	18 ms
Number of shocks per direction	3
Test directions	X-, Y- and Z-axis (pos. and neg.)
Result	Test passed
Ambient conditions
Ambient temperature (operation)	-60 °C … 110 °C (Operating temperature range incl. self-heating; for max. short-term operating temperature, see RTI Elec.)
Ambient temperature (storage/transport)	-25 °C … 60 °C (for a short time, not exceeding 24 h, -60 °C to +70 °C)
Ambient temperature (assembly)	-5 °C … 70 °C
Ambient temperature (actuation)	-5 °C … 70 °C
Permissible humidity (operation)	20 % … 90 %
Permissible humidity (storage/transport)	30 % … 70 %