Schneider RE48ATM12MW Time Delay Relay

 Schneider RE48ATM12MW Time Delay Relay Installation Manual

Full Product Name: Harmony RE48A Series Electronic On-Delay Time Relay

Model: RE48ATM12MW (8-pin, 2 changeover contacts, 24~240V AC/DC, On-Delay only)

Note: This manual is compiled based on Schneider official datasheet, available for on-site installation, commissioning and document filing.

Table of Contents

RE48ATM12MW

RE48A: Harmony RE48A series, 48×48mm panel-mount electronic time delay relay

T: On-Delay (single function, power-on delay only)

M: Wide supply voltage 24…240V AC/DC

12: 2 changeover contacts (2C/O)

W: 8-pin plug-in socket interface

Core Definition: Single-function On-Delay Relay. It cannot be switched to off-delay, pulse or flashing modes.

2. Main Electrical Specifications

3. Operating Logic (On-Delay)
4. Power applied to A1/A2 → timing starts;
5. Before timing elapses: contacts remain in initial state;
6. When preset delay expires: both sets of changeover contacts operate simultaneously;

⚠️ Important: Front panel DIP selector

Position 1: Both outputs timed

Position 2: One timed output, the other instantaneous upon power-up

4. Power removal resets the relay; timing restarts after re-energization.
5. Matching Sockets & Accessories

Socket is NOT supplied with relay and must be ordered separately:

1. DIN rail mounting socket: RUZC2M (8-pin screw terminal, most common)
2. PCB mounting socket: RE48ASOC8SOLD

Optional Accessories:

RE48ASETCOV: Setting protective cover (prevents unauthorized adjustment)

RE48AIPCOV: IP64 dust & waterproof front cover

5. 8-Pin Terminal Definition (RUZC2M Socket)

2, 7: A1, A2 Coil Power Terminals

1-3-4: 1st changeover contact set

8-5-6: 2nd changeover contact set

6. Setup Procedure
7. Toggle front panel time base selector (s/min/h)
8. Select range limit via rotary knob (e.g. 30s range)
9. Rotate pointer knob to set target delay
10. Select operating mode: Dual timed outputs / One timed + one instantaneous output
11. Alternative Replacement Models

Direct Drop-in Replacement

1. RE48AMH13MW (8-pin, multi-function version). Supports on-delay, pulse timing and more. Fully interchangeable with the same socket.

Difference: ATM = On-Delay only; AMH = Multi-function

Compact Alternative (Integrated DIN rail type, no separate socket)

RE22R2AMU (DIN rail mounted, smaller size, not suitable for 48×48 panel cutout installation)

8. Typical Application Scenarios

Fan & pump startup delay, star-delta motor starting delay

Sequential startup of conveyor systems, equipment power-on buffer delay

HVAC system timing control, lighting delayed switch-on

9. Risks & Prohibitions
10. Do not feed voltage higher than 250V into contact circuits; freewheeling diode recommended for DC inductive loads;
11. Brief power interruption <10ms will NOT trigger reset; sufficient power-off duration is required for reliable reset;
12. This model has no external reset terminal. Reset can only be achieved by cutting supply power;
13. Avoid environments with continuous condensation. Add filtering if installed close to inverters for EMC suppression.
14. Safety Instructions (Mandatory Reading)
15. Product Overview & Model Description
16. Matching Sockets & Accessory Selection
17. Two Installation Methods & Procedures
18. Terminal Definition & Standard Wiring Diagram
19. Parameter Setting Procedure
20. Power-on Commissioning Steps
21. Electrical Specifications
22. Troubleshooting Guide
23. Installation Restrictions & Environmental Requirements
24. Safety Instructions ⚠️【Important】
25. Cut off upstream power supply before all installation, wiring and disassembly operations. Live working is forbidden;
26. Contact circuits must not exceed rated load: 5A/250V AC. Freewheeling diode is recommended for DC inductive loads;
27. Do not deploy in flammable/explosive environments, locations with continuous condensation or corrosive gas;
28. No serviceable parts inside the unit. Do not disassemble; replace complete unit upon failure;
29. Verify supply voltage before installation: 24～240V AC/DC. Voltage >264V is prohibited;
30. Tightening torque for socket terminals: 0.8～1.2 N·m. Avoid over-tightening which cracks plastic base.
31. Product Overview

Function: Single-function On-Delay (Power-On Delay)

Form Factor: 48×48mm panel mount, 8-pin plug-in interface

Power Supply: Wide range 24…240V AC/DC

Output: 2 sets of changeover contacts (2C/O)

Delay Range: 0.02s ~ 300h, time base selectable via front panel switch

Protection Rating: Front IP50, housing IP40

Model Code Recap

RE48A-T-M-12-W

RE48A: 48×48 panel time relay

T: On-Delay (single function)

M: 24~240V AC/DC wide voltage supply

12: 2 changeover contacts

W: 8-pin circular plug socket

3. Matching Socket & Optional Accessories

Socket is not included with RE48ATM12MW and must be ordered separately

4. Two Installation Procedures

Method 1: DIN Rail Mounting (RUZC2M Socket)

1. Align clips of RUZC2M socket onto standard 35mm DIN rail, press down until fully locked;
2. Loosen socket terminal screws with screwdriver for wiring;
3. Complete all cable wiring;
4. Vertically align RE48ATM12MW with 8-pin socket, press evenly until fully seated;

Do not force insertion at an angle to prevent bending of contact pins.

Method 2: Control Cabinet Panel Cutout Mounting

1. Panel cutout dimension: 48⁺⁰·⁶₋₀ mm × 48⁺⁰·⁶₋₀ mm
2. Applicable panel thickness: 1mm～10mm
3. Insert relay body from front of panel through cutout;
4. Fit mounting bracket at rear of panel, tighten fixing screws evenly on both sides;
5. Connect 8-pin wiring socket from rear side;

Reserve ≥10mm clearance between adjacent devices for heat dissipation.

5. 8-Pin Terminal Definition (Standard RUZC2M Socket)

Front Panel Function Selector Switch

Position 1: Both outputs timed (Factory Default)

Position 2: One timed output, one instantaneous output upon power-up

Standard Wiring Guide

1. Power circuit: Control supply connected to 2,7 (A1/A2)

AC supply: L and N can be connected to 2/7 arbitrarily, no polarity

DC supply: Positive/negative polarity interchangeable, universal for AC & DC

2. Load Circuit:

Common terminal 1 → Timed NO 3; Common terminal 8 → Timed NO 6

Operating Logic: Power applied to 2,7 → timing starts; After preset delay, 1-3 closed, 8-6 closed. Relay resets immediately after power cut.

6. Front Panel Parameter Setting Steps
7. Energize relay (UP LED indicator lights = standby timing status);
8. Time base selector: Choose s / min / h (Seconds / Minutes / Hours);
9. Rotate adjustment knob to set target delay duration;
10. Toggle function selector: Dual timed outputs / One timed + one instantaneous output;
11. Optionally install RE48ASETCOV protective cover to lock parameters.

Available Delay Ranges

0.02–1.2s / 0.05–3s / 0.2–12s / 0.5–30s

2–120s / 5–300s / 0.2–12min / 0.5–30min

2–120min /5–300min /0.2–12h /0.5–30h /2–120h /5–300h

7. Power-on Commissioning Procedure
8. Check wiring under power-off condition; confirm no short circuit in power and load circuits;
9. Switch on power; steady UP LED = timing standby state;
10. Wait until preset delay expires;
11. Upon delay completion: Contacts switch state;
12. Cut power supply to terminals 2,7 for relay reset; timing restarts after re-power;
13. Perform multiple cycle tests to verify timing accuracy;

Brief power interruption <10ms cannot reset relay. Complete power cut ≥50ms required for reliable reset.

8. Core Electrical Specifications

9. Troubleshooting Table

10. Installation Restrictions & Operating Boundaries

❌ Forbidden Operations:

1. Apply voltage exceeding 250V to contact circuits;
2. Mount in close proximity to inverters and large contactors (strong electromagnetic interference);
3. Enclosed installation causing heat accumulation; continuous operation above 55 ℃ ambient temperature;
4. Pull cables to forcibly unplug relay, resulting in bent socket pins;
5. Deploy for high-frequency pulse control (accelerates electronic component aging).

✅ Recommendations:

Install surge absorption components in parallel for inductive loads (contactor coils); Reserve ventilation space inside control cabinet; Use 0.75～1.5mm² copper cables.

Appendix: Alternative Reference

Direct socket-compatible replacement: RE48AMH13MW (8-pin multi-function model)

Difference: ATM = On-Delay only; AMH supports on-delay, off-delay, flashing and other modes.