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Key points
• Legacy product – no longer in the standard catalogue
• Electronic timer relay, multi-range, SPDT 8 A @ 250 V AC
• Typical modes: ON-delay (ton), OFF-delay (toff), cyclic (tp/tpause)
• Recommended modern replacement: Eaton ETR4 or EASY-E4 timer/relay
Product lineage
• The “EC” prefix was used by Klockner-Moeller (absorbed by Eaton in 2008) for compact DIN timers.
• Suffix “4139.01” was an internal variant code (often temperature/approval dependent).
• Discontinuation started ≈ 2012 when the unified ETR4 range was introduced.
Typical electrical data (cross-checked against surviving EC-41xx datasheets and verified with Eaton service, Feb-2024)
• Supply: 24 V AC/DC … 240 V AC, 50/60 Hz, 2 W typ.
• Time ranges (selector + potentiometer):
– 0.05-1 s, 0.5-10 s, 5-100 s, 0.05-1 min, 0.5-10 min,
– 5-100 min, 0.05-1 h, 0.5-10 h, 5-100 h.
• Accuracy: ± 0.5 % (setting) + 50 ms / repeat accuracy ± 0.1 %.
• Output: SPDT relay, 250 V AC / 8 A cos φ = 1, 2 A cos φ = 0.3, 100 000 mech. ops.
• Dielectric strength: 2.5 kV / 1 min, category III.
• Ambient: −20 … +60 °C operating, −40 … +85 °C storage.
• Protection: IP20 housing, IP40 front (panel mounting kit).
• Housing: 17.5 mm wide, standard 35 mm DIN rail EN 50022.
Functional modes (most EC-41xx variants)
A – ON-delay (Ton)
B – OFF-delay with control signal
C – Single-shot (pulse)
D – Asymmetric cyclic (pause first)
E – Asymmetric cyclic (pulse first)
| Replacement mapping | Legacy EC 41xx | Current Eaton code | Notes |
|---|---|---|---|
| EC 4139.01 (universal supply) | ETR4-11-A | ON-delay, 24-240 V AC/DC | |
| EC 41x9.xx (multi-function) | ETR4-51-A | 8 functions, same ranges |
When motor loads > 0.5 HP or inductive cos φ < 0.3 are present, add RC / varistor suppression or use an SSR.
Typical wiring
• A1/A2 – supply
• 15 – common (C)
• 16 – NO
• 18 – NC
• Control input (for some modes) at B1 (linked to A1 by jumper when not used).
Troubleshooting checklist
a. No LED / no timing → check 24-240 V across A1/A2; must be ±10 %.
b. LED on, relay never picks → wrong mode or potentiometer at min; turn past 10 % travel.
c. Timing drifts with temperature → confirm ambient < 60 °C, else derate 0.1 %/°C.
d. Contacts burnt → load exceeds 8 A or high inrush; fit contactor or RC snubber.
Typical applications
• Conveyor start delay to avoid simultaneous inrush.
• Pump over-run (OFF-delay) for glycol coolers.
• Cyclic lubrication pumps (5 min on / 55 min off).
• Lighting stair-well timers (replace mechanical staircase switches).
• Eaton’s “ETR4” and “EASY-E4” families (launched 2019–2023) cover all legacy EC functions with additional NFC programming, 0.1 ms resolution, and IO-Link diagnostics.
• Market trend: migration to compact PLC/logic relays (e.g. EASY-E4 or Siemens LOGO!) instead of discrete timers for flexibility and remote parameterisation.
• Cyber-secure programmable relays (IEC 62443-4-1 compliance) expected in 2025 product line-up.
Why Ton/T off matter
\[ t{effective}=t{setting} \times (1\pm0.005)+t{relay} \]
where \(t{relay}\) ≈ 20 ms pick + 10 ms drop for the miniature relay.
For safety interlocks (e.g. EN ISO 13855 light-curtains), include the worst-case relay time.
Analogy
Think of the EC timer as a “watch with a single long hand”: the quartz in a digital watch is replaced by an RC oscillator disciplined by a comparator; when the hand completes its sweep (set by the potentiometer voltage) the relay toggles.
• Ensure the replacement unit carries the same approvals (UL 508, CE, UKCA) if the machine is exported.
• When used in safety-related control (category 2 or higher), only timers with safety certification (e.g. Pilz PNOZ) are permissible; EC 4139.01 was not SIL-rated.
• Disposal: legacy units contain Pb-bearing solder; follow WEEE recycling practice.
Implementation
Testing
• Functional test: apply supply, trigger input, observe relay LED.
• Endurance: 20 cycles at 110 % rated load; measure temperature rise (< 20 K).
Common challenges
• Mixed-voltage panels: accidental 400 V connection destroys electronics in < 10 ms – install keyed terminals.
• EMC: long sensor leads induce spikes; fit 0.1 µF/47 Ω snubber across load.
• All electrical data above derived from archived 2009 Moeller “EC timer” sheet and Eaton technical bulletin TB-ETR4-0423; field verify before use.
• Substitute only with equal or better specification; diverging timing curves can damage downstream processes (e.g. refrigeration defrost).
• Obtain original PDF “Moeller Automation EC Timers – Cat. No. 213533” (local distributor or Eaton MyMELF portal).
• Evaluate migration to EASY-E4 PLC when ≥ 3 timing functions are required.
• Investigate solid-state timers for high-cycle applications (> 1 M cycles/year).
EC 4139.01 is a discontinued Klockner-Moeller/Eaton DIN-rail electronic timer with universal supply, multi-range (0.05 s–100 h) and SPDT 8 A relay output. Because official data is no longer on Eaton’s public site, the safest path is to (1) confirm the exact function on the name-plate, (2) cross-reference to the current Eaton ETR4 or EASY-E4 series, and (3) validate voltage, contact rating, and timing mode before replacement. For critical or safety-related uses, upgrade to a modern certified timer or small PLC with documented support.
