Schneider Electric CAD50E7 TeSys D Relay 5NO 48V AC

What the CAD50E7 is and how its code is built

This page covers the CAD50E7, a TeSys D control relay from Schneider Electric with five normally open contacts and a 48 V AC 50/60 Hz coil. It belongs to the CAD range, which uses the same compact housing as the TeSys D contactors but is built for control duty. Seven Star LLC is an independent supplier in Muscat and supplies the CAD50E7 in Oman and the GCC.

Part-number logic: the family is TeSys D control relay (CAD), the contact block is five normally open contacts, and the suffix E7 corresponds to the 48 V AC 50/60 Hz coil. That is exactly what the manufacturer’s description says for this reference, so a quote request should always quote the complete CAD50E7 and never just the family prefix.

Choosing the supply for the CAD50E7 coil

The coil is the one part that distinguishes the CAD50E7 from its siblings, so it deserves the closest reading.

A 48 V AC coil is another transformer-fed option, used on equipment whose control winding delivers 48 V. Compared with 24 V AC it halves the current for the same volt-amperes, which helps when many relays share one winding or the cable run is long. The datasheet figures of 70 VA inrush and 8 VA hold-in at 50 Hz give about 1.5 A at pull-in and 0.17 A held in at 48 V.

The window of 0.8 to 1.1 Uc at 50 Hz is about 38.4 to 52.8 V, and 40.8 V at the low end on a 60 Hz supply. The drop-out band of 0.3 to 0.6 Uc is about 14.4 to 28.8 V. This coil should not be confused with the 48 V DC reference of the same family: the AC and DC coils use different internal designs, and a relay with the wrong coil type will hum, overheat or fail to hold, depending on which way round the mistake is made.

Sizing the coil circuit is straightforward with the datasheet figures. The listed power is 70 VA inrush and 8 VA hold-in at 50 Hz; at 48 V that is roughly 1.46 A on pull-in and 167 mA held in. The coil operates within 38.4 to 52.8 V at 50 Hz (0.8 to 1.1 Uc), from 40.8 V at 60 Hz and releases within 14.4 to 28.8 V (0.3 to 0.6 Uc). As these currents are derived rather than quoted, leave margin in the supply and check them against the nameplate of the exact relay you receive.

CAD50E7 specification table

Pre-order checklist for the CAD50E7

• Coil: 48 V AC 50/60 Hz, confirmed from the supply drawing or the nameplate of the relay being replaced.
• Contacts: five normally open contacts, matched to the interlock and signalling circuits.
• Supply sizing: about 1.46 A at pull-in and 167 mA held in (derived from the datasheet power).
• Window: operates within 38.4 to 52.8 V at 50 Hz (0.8 to 1.1 Uc), from 40.8 V at 60 Hz and releases at 14.4 to 28.8 V (0.3 to 0.6 Uc).
• Contact load of the CAD50E7: 10 A thermal, AC-15, AC-14 or DC-13 duties; use a contactor for motor-power loads.
• Space: 77 mm high, 45 mm wide and 84 mm deep.
• Environment: operation up to 60 °C, up to 70 °C with derating; storage -60 to 80 °C.
• Type: AC and DC coils of the same voltage are different references; do not mix them.

Where the contacts of the CAD50E7 earn their keep

The 5 NO configuration is the version for pure signal multiplication. With no normally closed contacts, all five poles close when the coil is energised, so a single command can start, indicate and permit several circuits at once. The datasheet lists operating times only for the normally open contacts, as there are no normally closed contacts to describe.

Choose it when a single initiating contact, for example a PLC output or a protection relay trip contact, has to be repeated on five independent circuits: alarm annunciation, a shutdown loop, a remote indication, an interlock to another panel and a counter or logger. If any of those circuits needs a contact that opens when the relay operates, the 3 NO + 2 NC member of the family is the right choice instead.

Contact data from the datasheet apply to all five poles: 10 A conventional thermal current at 60 °C, utilisation categories AC-15, AC-14 and DC-13, a rated operational voltage up to 690 V AC, and a minimum switching capability of 17 V and 5 mA, which makes the contacts suitable for low-level signals as well as for 24 V PLC inputs.

Sibling references: CAD50E7 and the other CAD50 relays

The CAD50E7 is one member of a family of TeSys D control relays that share the housing, the contact data and the mounting. Only the coil voltage and type change from one reference to the next, together with the contact arrangement: the CAD32 series is 3 NO + 2 NC and the CAD50 series is 5 NO. The table lists the CAD50 references we are asked for most.

If the supply is not in the table, ask us; the CAD32 series has the other contact arrangement. AC-coil versions are 84 mm deep and DC-coil versions 93 mm, which matters in a shallow enclosure.

Applications of the CAD50E7 in Oman and the GCC

Low-voltage AC coils are used where a control transformer separates the relay circuit from the mains. In the GCC they appear mostly in machine panels, HVAC and pump control cabinets built by international manufacturers, where a 24, 42 or 48 V winding supplies relays, pilot lamps and solenoid valves. Here the relay is a repeater and interlock element between a controller output and field loads or drives.

Panels in the region commonly see high ambient temperatures, so the transformer that feeds the coil, not only the relay, deserves attention. The datasheet allows operation up to 60 °C with derating to 70 °C, but an undersized transformer in a hot cabinet is the more likely source of unreliable pull-in than the relay itself.

For the CAD50E7, that means five normally open contacts from one 48 V AC 50/60 Hz command, sitting next to LC1D contactors of the same TeSys D family on the same rail.

Fitting the CAD50E7 in a panel

Mount the CAD50E7 on a 35 mm DIN rail or on a plate; the datasheet lists both. It measures 77 mm x 45 mm x 84 mm and weighs 0.58 kg, so allow space for the wires to bend at the terminals and for air to circulate around the housing. Tighten the screw-clamp terminals to 1.7 N.m with a Philips No 2, Pozidriv No 2 or 6 mm flat screwdriver, and do not exceed the cable sizes of 1 to 4 mm² per terminal listed in the datasheet.

Commissioning is simple: energise the coil at nominal voltage, verify that all five poles move together, and check the contact action with a meter before connecting the field loads. The mechanical durability is 30 million cycles and the maximum operating rate is 180 cycles per minute, so in normal control duty there is no routine wear item to schedule. In a dusty site, clean the panel and check terminal tightness during planned shutdowns, because loose terminals, more often than the relay itself, cause intermittent faults.

RFQ details for the CAD50E7

• Full reference CAD50E7 and the quantity
• The coil voltage and type seen on the supply drawing or on the old relay nameplate
• The load or circuit each contact will switch (voltage, current, signal level)
• Panel or machine the relay must fit, and whether it is a spare, a replacement or a new installation
• Delivery location in Oman or the GCC and the date required

Documents and quotation

A datasheet for this product is attached on this page. It lists the electrical, mechanical and environmental data summarised above, and it is worth reading beside the panel drawing before you order.

Send us the part number, quantity and application and we will confirm availability and a quotation. Seven Star LLC is an independent supplier in Muscat and is not affiliated with the manufacturer.