Schneider LRD3355: TeSys Deca thermal overload relay, setting range 30 … 40 A, trip Class 10A, compatible with LC1D80 and other LC1D contactors listed below.
Thermal overload relays are a standard maintenance spare: after many years bimetals drift, and a relay damaged by a short circuit must be replaced.
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Technical data
| Schneider reference | LRD3355 |
|---|---|
| Product or component type | Differential thermal overload relay |
| Relay application | Motor protection |
| Product compatibility | LC1D80; LC1D95 |
| Network type | DC; AC |
| Thermal overload class | Class 10A conforming to IEC 60947-4-1 |
| Thermal protection adjustment range | 30 … 40 A |
| [Ui] rated insulation voltage | Power circuit: 1000 V conforming to IEC 60947-4-1; Power circuit: 600 V conforming to CSA; Power circuit: 600 V conforming to UL |
| Network frequency | 0…400 Hz |
| Mounting support | Plate, with specific accessories; Rail, with specific accessories; Under contactor |
| Tripping threshold | 1.14 +/- 0.06 Ir conforming to IEC 60947-4-1 |
| Auxiliary contact composition | 1 NO + 1 NC |
| [Ith] conventional free air thermal current | 5 A for signalling circuit |
| Permissible current | 0.72 A at 500 V AC-15 for signalling circuit; 0.06 A at 440 V DC-13 for signalling circuit |
| [Ue] rated operational voltage | 1000 V AC 0…400 Hz for power circuit conforming to IEC 60947-4-1 |
| Associated fuse rating | 4 A gG for signalling circuit; 4 A BS for signalling circuit |
| [Uimp] rated impulse withstand voltage | 6 kV conforming to IEC 60947-1 |
| Phase failure sensitivity | Tripping current 130 % of Ir on two phase, the last one at 0 |
| Control type | Red push-button: stop; Blue push-button: reset |
| Temperature compensation | -20 … 60 °C |
| Connections – terminals | Power circuit: screw clamp terminals 1 cable(s) 4 … 35 mm² flexible without cable end |
| Condition | New, original Schneider Electric |
Main characteristics
- thermal overload relays
- TeSys Deca
- 30…40A
- class 10A
- motor protection
Typical applications
- Replacement of a drifted or damaged LRD relay
- Motor starters with TeSys Deca LC1D contactors
- Star-delta starters (set to 0.58 x motor current)
- Protection of motors with rated current 30 … 40 A
Compatibility and replacement
For separate mounting on a rail or plate Schneider offers a terminal block adapter (LAD7B106 for LRD01-35). If the motor current is near the top of the range, use the next range up so the setting sits mid-scale.
Frequently asked questions
Can it be mounted separately from the contactor?
Yes, with the Schneider terminal block adapter for independent mounting on a rail or plate.
Does it detect phase loss?
Yes. Schneider gives the phase failure sensitivity as: Tripping current 130 % of Ir on two phase, the last one at 0.
What does class 10A mean?
It is the trip class per IEC 60947-4-1: at 7.2 times the setting current the relay trips within 2 to 10 seconds, which suits standard motors with normal starting times.
What current range does it cover?
30 … 40 A, set on the front dial.
How fast can you deliver, and is there a warranty?
Air shipping usually takes 5 to 7 days once the part is ready, to almost any country. Each part is new and original with a 1-year warranty. Message us on WhatsApp with the order number for a quotation.
How to order
Message us the order number and quantity. For breakdowns, tell us the delivery address and we will offer the fastest shipping option. If the exact part is discontinued, we confirm the official successor before quoting.
Need it fast? Send the order number, quantity and delivery country on WhatsApp or through the inquiry form and we reply with a quotation the same working day. All parts are new and original, covered by a 1-year warranty, and ship worldwide by air in 5 to 7 days once ready (shipping, payment and warranty). Local agents: Saudi Arabia, Iraq, the UAE, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan.
