Beckhoff EL9550 System Terminal

The Beckhoff EL9550 is a dedicated system terminal designed to protect EtherCAT installations from transient overvoltages and electrical surges. Featuring integrated surge filters for both the 24 V field supply and system supply, the EL9550 shields connected devices from high-energy switching spikes or lightning-induced disturbances.

Ideal for harsh industrial environments, it ensures greater system stability and extended service life by maintaining safe voltage levels across your I/O infrastructure.

Technical Specifications

Manufacturer: Beckhoff
Part Number: EL9550 Beckhoff
Product Type: System Terminal / Surge Filter
Technology: Surge filter system and field supply
Nominal Voltage: 24 V DC (-15%/+20%)
Surge Filter – Field Supply: Yes
Surge Filter – System Supply: Yes
Rated Current (Field Supply): ≤ 10 A
Rated Current (System Supply): ≤ 1.5 A
Electrical Isolation: 500 V (E-bus/field potential)

Electrical & Environmental

Operating Temperature: -25°C to +60°C
Storage Temperature: -40°C to +85°C
EMC Standards: EN 61000-6-2 / EN 61000-6-4
Vibration/Shock Resistance: EN 60068-2-6 / EN 60068-2-27
Protection Rating: IP20
Pluggable Wiring: For all ESxxxx terminals

Mechanical & Mounting

Dimensions (W x H x D): 12 mm x 100 mm x 68 mm
Weight: Approx. 50 g
Material: Polycarbonate
Mounting: DIN rail, 35 mm (EN 60715)
Wiring Method:
– Solid: 0.08–2.5 mm²
– Stranded: 0.08–2.5 mm²
– Ferrule: 0.14–1.5 mm²
AWG Range: AWG28–14
Stripping Length: 8–9 mm
Current Load (Power Contacts): Max. 10 A

Compliance & Approvals

Certifications: CE, CCC, UL, ATEX, IECEx, cFMus
ATEX Marking: II 3 G Ex ec IIC T4 Gc
IECEx Marking: Ex ec IIC T4 Gc
cFMus:
– Class I, Division 2, Groups A, B, C, D
– Class I, Zone 2, AEx ec IIC T4 Gc

Key Features

✅ Dual Surge Protection: For both 24 V field and system power.

✅ Protects EtherCAT Terminals: From overvoltage and line-bound disturbances.

✅ Compact & Lightweight: Slim 12 mm housing ideal for dense installations.

✅ Tool-Free Wiring: Spring actuation for fast installation.

✅ DIN Rail Mountable: Industry-standard EN 60715 compatibility.

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Protect your EtherCAT I/O from electrical surges with this compact, certified surge filtering solution—trusted in industrial environments worldwide.

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