2906809

What does this surge protection device protect in an industrial control system?

It is designed to protect sensitive 2‑wire signal circuits from transient overvoltages, diverting surge energy away from connected instrumentation and control inputs while keeping the circuit operating conditions stable.

Which signal types is it typically used with?

It is intended for 2‑wire floating signal circuits such as 0(4)–20 mA current loops and is suitable for use with HART-compatible loops.

What is the nominal operating voltage for the protected circuit?

The nominal voltage is 24 V DC, with a maximum continuous voltage of 30 V DC (also specified as 21 V AC).

Will it affect my analogue signal during normal operation?

It is designed for low impact on the signal path, with low leakage current (≤ 5 µA at maximum continuous voltage) and specified insertion attenuation of typically 0.3 dB (≤ 250 kHz in a 150 Ω system).

Is the module suitable for maintenance without disturbing the loop?

Yes. The protective element is pluggable, and insertion/removal is intended to be impedance-neutral so the signal is not influenced during maintenance work.

How can I tell if the protection is still functioning?

It includes an integrated, mechanical status indicator on the module, providing visual condition monitoring without requiring an auxiliary power supply.

Can it be monitored remotely as part of a larger panel build?

Yes. An optional remote signalling module set can be used to monitor neighbouring devices in the same product range; the TTC-6-FMRS-UT accessory is specified to monitor up to 40 items.

What are the surge performance ratings?

Key ratings include nominal discharge current In (8/20 µs) of 5 kA line-line and 5 kA line-earth, pulse discharge current Iimp (10/350 µs) of 0.5 kA line-line and 0.5 kA line-earth, and a total discharge current Itotal (8/20 µs) of 10 kA.

What are the voltage protection levels (clamping levels)?

For line-line protection, the voltage protection level Up is specified as ≤ 200 V (C1), ≤ 320 V (C2), and ≤ 50–55 V (C3, depending on test current). For line-earth, Up is specified around ≤ 700–750 V across the listed test classes.

How fast does it respond to a surge event?

Response time is specified as ≤ 1 ns for line-line and ≤ 100 ns for line-earth.

What mounting method and panel footprint should I plan for?

It is a DIN-rail module for TH 35 rails. The housing is narrow at 6.2 mm wide (plus tolerance), with dimensions of approximately 105.8 mm high and 100 mm deep (including DIN rail 7.5 mm).

What wiring connections does it use?

It uses screw connections with an M3 thread. The recommended tightening torque is 0.5–0.6 Nm, stripping length is 8 mm, and supported conductor sizes are 0.2–2.5 mm² (flexible) and 0.2–4 mm² (solid), approximately AWG 24–12.

Is there a recommended back-up fuse for the signal loop?

Yes. The maximum required back-up fuse is specified as 630 mA (FF).

What environmental conditions can it operate in?

The operating temperature range is -40 °C to +85 °C. Permissible operating humidity is 5% to 95%, and it is specified for use up to 4000 m altitude (above mean sea level).

What ingress protection rating does the housing provide?

The device is rated IP20, suitable for installation inside an appropriate enclosure.

Does it have recognised approvals for industrial applications?

It is listed with approvals including UL Listed, CSA, and DNV GL (approval identifiers are provided in the manufacturer’s documentation).

Are replacement or add-on components available for this unit?

Yes. The surge protection plug can be replaced (for example, TTC-6P-1X2-24DC-I-P is listed as a spare part). Accessories include a fuse carrier (TTC-6-FC-UT) and remote signalling module set (TTC-6-FMRS-UT).

Can the module be tested for documentation purposes?

Yes. It is designed to support straightforward testing and documentation using CHECKMASTER 2 with pluggable protective modules.

What is included in the product assembly?

It consists of a base element and a protective plug, forming a divisible, two-section DIN-rail surge protection assembly (often referenced as TTC-6P-1X2-24DC-UT-I; Phoenix Contact 2906809).