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2838173 TT-2/2-24DC

2858881 TT-ST-2/2-24DC

2920735 TT-ST-2/2-S-24DC

2804610 LIT 1X2-24

2906798  TTC-6-1X2-24DC-UT

2906799  TTC-6-2X1-24DC-UT

Here’s a breakdown of the Phoenix Contact surge protection devices 

Phoenix Contact Surge Protection Devices

Model	Nominal Voltage	Max Discharge Current	Application
TT-2/2-24DC (2838173)	24V DC	10kA	Modular terminal block for signal circuit protection
TT-ST-2/2-24DC (2858881)	24V DC	10kA	Spring cage modular terminal block with surge protection
TT-ST-2/2-S-24DC (2920735)	24V DC	620A	Double-level terminal block for line-to-earth protection
LIT 1X2-24 (2804610)	24V DC	20kA	DIN rail module for floating signal circuits, HART-compatible
TTC-6-1X2-24DC-UT (2906798)	24V DC	10kA	Surge protection for 2-wire floating signal circuits
TTC-6-2X1-24DC-UT (2906799)	24V DC	10kA	Surge protection for two signal wires with common reference potential

Key Features Across the Series

✅ High Surge Protection – Handles up to 10kA–20kA discharge current.
✅ Compact & Pluggable Design – Easy integration into control panels.
✅ HART-Compatible Models – Ideal for measurement and control technology.
✅ Wide Voltage Range – Supports 24V DC applications.
✅ IEC & VDE Certified – Meets industry standards for surge protection.