Brand: Lovato Electric

Lovato RF383800 32-38 A Thermal Overload Relay

Name: Lovato RF383800 Overload Relay | Seven Star LLC
Brand: Lovato Electric
SKU: RF383800

Description

An RF38-family overload relay set between 32 and 38 A

A motor needing overload protection in the 32-38 A band can use the RF383800, a thermal relay of the Lovato Electric RF38 family with phase-failure detection and a trip indicator.

Tripping class is 10A, the reset mode is manual or automatic, and the auxiliary contact block provides 1 NO and 1 NC for the control circuit. Insulation voltage is 690 V.

Technical specifications

Parameter	Specification
Order code	RF383800
Product type designation	RF38
Product designation	Motor protection relay
Number of poles	3
Pollution degree	3
Frontal IP degree	IP20
Type of release	Thermal
gG (IEC)	63 A
aM (IEC)	40 A
RK5 (UL)	150 A
Functions and protections provided	Phase failure detection
Reset mode	Manual or automatic
Rated insulation voltage Ui IEC/EN	690 V
Rated impulse withstand voltage Uimp	6 kV
Rated operational voltage	690 V
Operational frequency (min)	0 Hz
Operational frequency (max)	400 Hz
Operational current min	32 A
Operational current max	38 A
Tripping class	10A
Test Button	Yes
Trip indicator	yes
Terminals type	screw and washer
Terminals screw	M4
Terminals width	12.6 mm
Terminals tool	Phillips 2
Auxiliary contacts, NO	1
Auxiliary contacts, NC	1
Auxiliary Rated insulation voltage Ui IEC/EN	690 V
Auxiliary Rated impulse withstand voltage Uimp	6 kV
Auxiliary Rated operational voltage	690 V
Auxiliary circuit type	screw and washer
Auxiliary circuit screw	M3.5
Auxiliary circuit width	8 mm
Auxiliary circuit tool	Phillips 2
Operating temperature (min)	-25 °C
Operating temperature (max)	60 °C
Storage temperature (min)	-50 °C
Storage temperature (max)	70 °C
Compensation temperature (min)	-20 °C
Compensation temperature (max)	60 °C
Max altitude	3000 m
Operating position, normal	Vertical plan
Operating position, allowable	±30°
Fixing	Direct mounting on BF09- BF38-
Weight	160 g

Matching the relay to the motor

Choose by current window first (32-38 A), then by trip class (10A) and reset mode, then check that the relay mounts to the contactor you plan to use.

Short-circuit protection is separate: the datasheet quotes 63 A gG and 40 A aM as maximum fuse sizes for this relay.

Application and wiring

The relay is intended to sit directly below a matching contactor for a compact direct-on-line starter, or to be mounted separately on a base. Wire the NC contact in the contactor coil circuit so that a trip drops the motor.

Connection is by screw and washer. Keep an eye on panel temperature, because ambient heating shifts the trip point of a thermal relay.

For panel design and commissioning, the practical figures to keep at hand are: terminals type screw and washer; terminals screw M4; terminals width 12.6 mm; terminals tool Phillips 2; auxiliary circuit type screw and washer; auxiliary circuit screw M3.5; auxiliary circuit width 8 mm; auxiliary circuit tool Phillips 2; operating temperature (min) -25 °C; operating temperature (max) 60 °C; storage temperature (min) -50 °C; storage temperature (max) 70 °C; max altitude 3000 m; operating position, normal Vertical plan. These come straight from the datasheet and are repeated here so that the key installation limits are visible without opening the PDF.

Documents and quotation

Attached is the English datasheet that Lovato Electric’s online catalogue generates for RF383800; the specification table above reproduces its values. Make sure of the motor full-load current, the matching contactor and whether a manual or automatic reset is wanted before placing an order, since the published values can change. More products of this type are under contactors & overload relays. Use the quotation form with the code RF383800 and your quantity; availability is confirmed by Seven Star LLC, an independent supplier in Muscat.

Datasheets & Documents

Datasheet Lovato Electric RF383800 datasheet (EN, catalogue export) Download

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About brand

Lovato Electric is the Italian manufacturer of low-voltage electrical components for industrial automation and power distribution: contactors, motor protection circuit breakers, soft starters, variable speed drives, power factor controllers, transfer switch and generator controllers, and energy meters. It was founded in Bergamo in 1922 and has been run by the same family for four generations. Its headquarters is in Gorle, near Bergamo, and it celebrated its centenary in 2022.

Seven Star LLC is an independent supplier in Muscat. We list Lovato motor control, drives and power management products, and supply them to panel builders, contractors and maintenance teams in Oman and the GCC by order code.

Lovato Electric at a glance

Established	1922, Bergamo, Italy
Headquarters	Gorle (Bergamo), Italy
Ownership	Private, family-run for four generations
Product families	Contactors and relays, motor protection circuit breakers, motor starters, soft starters, variable speed drives, power factor controllers, ATS and gen-set controllers, multimeters and energy meters, micro PLCs

Lovato products we list

Family	Models	Typical use
Contactors	BF0910A230, BF1810A230, BF2510A230, BF2600A230, BF09T4A230 4-pole, BFS0923A024, 11BG0910A230 mini, 11BGR0901A048 reversing	Switching motors, heaters, lighting and capacitor banks
Motor protection and starters	SM1P0650, SM1P1000, SM1P3200, M1P enclosed DOL starter, ME024FD024, ME070RSD024, 31L48 time relay	Short-circuit and overload protection and direct starting of motors
Soft starters	ADXL0030600, ADXL0085600, ADXL0135600, ADXT0034, ADXT0084, ADXT0139	Reducing starting current and mechanical shock on pumps, fans and compressors
Variable speed drives	VLA1, VLB1, VLB3 0.75 kW, VLB3 2.2 kW, VLB3 5.5 kW, VLB3 22 kW, VT1	Speed control of pumps, fans and conveyors to save energy
Power management and control	DCRG8, DCRL8 PF controllers, ATL600 ATS controller, RGK600 gen-set controller, DMG200 multimeter, DMED300T2 energy meter, LRD20 micro PLC	Power factor correction, mains/generator changeover and energy monitoring

Lovato order codes describe the product. On a contactor such as BF0910A230, "BF09" is the frame and rated current (9 A in AC-3), "10" is the built-in auxiliary contact (one normally open), "A" means an AC coil and "230" is the coil voltage. The coil voltage must match the control circuit exactly, so it is the most common detail to check when replacing one. For motors, a soft starter limits the inrush current at start and stop, while a variable speed drive controls the speed continuously and saves energy on pumps and fans that do not need full flow all the time.

Where Lovato products are used

In Oman and the GCC, Lovato components are built into motor control centres, pump and HVAC panels, capacitor banks for power factor correction, generator and ATS panels, and machine control panels for industry, water and buildings.

Ordering Lovato products: what we need

Send the full Lovato order code. For contactors and starters, confirm the coil or control voltage. For drives and soft starters, send the motor power, current and supply voltage. For power factor controllers, send the number of steps and the CT ratio.

Facts checked against Lovato Electric company profile brochures, October 2026.

Browse Lovato Electric products by category: Motor Soft Starters, Automation Accessories, Controllers & Data Acquisition, PLC & I/O Cards, Circuit Breakers, Diesel Generator Spare Parts.